Physics Chapters to Score 90+ in JEE Main 2027: ABJ Sir’s Strategy

Most students ask the wrong first question about Physics. They ask which chapters to skip. ABJ Sir's answer, after analysing seven years of JEE Main papers, is that skipping is the wrong frame altogether. Physics rewards coverage: every chapter gets roughly a question, a few chapters get two, and the paper is set so that a student who has attended lectures, practised PYQs, given tests, and learnt question selection can reach 90 out of 100. Two questions are allowed to go wrong in that calculation, because a couple of questions can be Advanced level or built on an obscure fact. The point is not that 90 is easy. The point is that 90 is a planning problem, not a talent problem, and planning is exactly what this guide does.

There is one more reason Physics deserves this attention first. The same 90 marks in Mathematics, ABJ Sir says, would take about double the time in Main. In Advanced the equation reverses, but Main is the paper in front of you, and in Main, Physics gives back the most marks per hour of preparation. That single fact should decide where your next month of effort goes.

A note on honesty before the lists begin. Every number in this guide comes from ABJ Sir's analysis of past papers, not from an official NTA weightage table, because NTA does not publish one. Past trends also do not guarantee future distribution. Treat every figure here as a planning estimate from seven years of evidence, and use it to order your preparation, not as a list of chapters to skip.

The Short Answer: Why 90 Is Realistic

Start with the arithmetic of the paper, because the target only makes sense once the paper is clear. Physics in JEE Main is 25 questions, each worth 4 marks, for a total of 100. Twenty of them are single correct multiple choice questions, where one of four options is right and three are wrong. Five are integer or numerical value questions. Negative marking applies to both types, so guessing carries a cost in every section.

The 90+ plan in four steps

Now the target itself. A student who has attended lectures properly, worked through PYQs, given a good number of tests, and learnt to select questions can reach 90 out of 100 without anything extraordinary. The calculation already allows two questions to go wrong, which covers the Advanced level question or the question built on an obscure fact that appears in most papers. What it does not allow is leaving whole chapters untouched, because the paper spreads one question across nearly every chapter. Coverage is the strategy, and the tiers below are simply coverage in the right order.

The Paper Pattern, and How It Became Stable

The pattern students face today did not arrive all at once. It settled in stages over seven years, and knowing the stages explains why the current pattern is unlikely to surprise you. In 2020, integer type questions were introduced alongside single correct questions. During Covid, students were given relief: the integer count went up to 10, with only 5 to be attempted. That arrangement continued into 2022, with one important change: negative marking was introduced for integer questions too, where earlier there had been none.

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The 2024 syllabus change deserves a separate note, because students often overstate it. Chemistry was squeezed the most, and scoring in Chemistry became somewhat easier compared to Mathematics and Physics. Physics lost Communication Systems as a full chapter, plus a few small topics here and there. The core of Physics did not change, which is why seven year trends still read cleanly for this subject.

For 2027, then, prepare on a stable base: 20 single correct questions and 5 compulsory integer questions, all with negative marking, for 100 marks. No choice inside the paper, no section to hide in, and no pattern change to hope for. Stability is good news for planning, because it means the tier lists below rest on a pattern that has held for two full years.

Class 11 vs Class 12: The Myth About Weightage

One myth needs clearing before any chapter list makes sense: the idea that Class 12 dominates the Physics paper. It does not, at least not to the extent students believe. Class 12 weightage is higher than Class 11, that much is true. But it is not the case that something like 75 percent of the paper comes from Class 12. The real split, from ABJ Sir's analysis, is far more balanced.

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The practical consequence is straightforward. A student who neglects Class 11 to chase Class 12 is abandoning nearly half the paper. Mechanics, which is largely a Class 11 story, alone accounts for a large block of questions, and Rotational Motion, Thermodynamics, and Kinematics all sit in the compulsory tier. Equally, a student who only revises Class 11 leaves the larger half untouched. The honest plan is a 45 to 55 split of effort, with Tier 1 chapters from both years finished first, regardless of which year they belong to.

Where the 25 Questions Come From

If the paper were divided by sections rather than chapters, two sections would swallow half of it. Electrodynamics and Mechanics together account for about 12 to 13 of the 25 questions. That single fact should shape your calendar: these two sections are not chapters, they are continents, and they deserve the largest blocks of time. Everything else follows in a clear order.

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One section in that table deserves special attention precisely because students ignore it: Properties of Matter. Elasticity, viscosity, and surface tension together give about one to two questions, and in some papers last year they gave three. Students leave this section out in large numbers, yet it is among the easiest reading in the syllabus. Easy marks left on the table are the most expensive kind, because they cost nothing to collect.

The same logic applies to Units, Dimensions and Error. One or two questions, small syllabus, and a chapter that also supports the experimental questions. It appears in Tier 2 and again in the quick marks section, which tells you how ABJ Sir rates it: a small chapter with an outsized return.

Chapters That Can Give Two Questions

NTA generally tries to ask one question from every chapter. That is the baseline, and it is why coverage beats depth in the first pass. But a handful of chapters break the baseline: two questions from the same chapter in a single paper are possible there. Knowing which chapters those are lets you weight your revision honestly, because a second question from a chapter you already studied is nearly free marks.

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One chapter that used to sit in this list has dropped out of it: Semiconductors. Before 2025, while the transistor section was still included in semiconductors, two questions from semiconductors were common, and several papers had two in the same paper. Since the transistor was removed, semiconductors mostly gives a single question, usually on logic gates or diodes. The lesson generalises: when the syllabus shrinks a chapter, its question count usually shrinks with it, so track removals the way you track weightage.

Topics Removed From the Syllabus

The 2024 rationalisation removed a set of topics from JEE Main Physics, and students should know the list for two reasons. First, time spent on removed topics is time taken from live ones. Second, and more subtly, removed does not always mean never asked, so the list needs its exceptions stated plainly rather than memorised blindly.

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Two rows in that table carry the real lesson. Potentiometer is the exception that proves the rule: it was removed, yet questions still come, because examiners treat it as current distribution in parallel rather than a standalone concept. Resolving power is the opposite trap: one question appeared last year, and students who chase that single question into a full study of the topic are spending hours on something the syllabus does not contain. ABJ Sir's position is blunt here. One question across years of papers, asked by mistake since it is not in the syllabus, is not a reason to open the topic at all. Study the syllabus as published, keep the potentiometer exception in mind, and let the rest of the removed list stay removed.

Tier 1: Compulsory Before January

Tier 1 is the non negotiable core: the chapters that must be done before the January attempt. ABJ Sir divides all chapters into three tiers, and Tier 1 is where the paper is won. It splits naturally by year, with six Class 12 chapters and four Class 11 chapters, and every one of them earns its place through question count, not reputation.

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Modern Physics inside Tier 1 needs unpacking, because the name covers several topics. It means Modern Physics part one and part two together: photoelectric effect, atomic structure, nuclear physics, and semiconductors. Semiconductors sits inside Modern Physics here, which is why the tier list mentions it in two places without contradiction: it is a Tier 1 topic as part of Modern Physics, and it also appears in Tier 2 in its own right as a chapter to strengthen.

Rotational Motion carries one deliberate exception, and it is worth understanding the reasoning rather than just the rule. Inside Rotational Motion, the last section, combined translation plus rotational motion, can be left out entirely for Main. The reasoning is return on investment. Perfecting that section can take around 25 hours, and the same 25 hours given to Modern Physics would fetch more marks. The question can still appear, since it is in the syllabus, but the time it demands does not match the marks it returns. That is a planning decision, not a claim that the section is unimportant, and it is the clearest example in this guide of thinking in marks per hour.

Tier 2: Desirable, Do Them Next

Tier 2 chapters are the desirable ones: they should be done, and they follow Tier 1 in order. A student who has finished Tier 1 and works through Tier 2 has covered the large majority of the paper's marks. Nothing here is optional in the long run, but the order matters when time is short, because Tier 2 after Tier 1 beats Tier 2 instead of Tier 1 every time.

• Capacitor: a natural extension of Electrostatics, and a chapter where combinations and charging behaviour give reliable questions.
• Electromagnetic Induction (EMI): Faraday's law, Lenz's law, and induced EMF; pairs closely with Alternating Current in revision.
• Alternating Current: LCR circuits, resonance, and phase; steady questions that reward a clean formula set.
• EM Waves: also a quick marks chapter, covered again below; the relation between electric field, magnetic field, and the speed of light dominates.
• Semiconductors: logic gates first, then Zener and PN diodes, all at NCERT level; mostly a single question now, but a reliable one.
• Units and Error: dimensions plus error analysis; small chapter, one or two questions, and support for the experimental questions.
• Experimental Skills: the 12 experiments detailed below; questions here are quick once the set-up is known.
• Simple Harmonic Motion: energy, phase, and pendulum questions; predictable and compact.
• Fluids and Elasticity: pressure, buoyancy, viscosity, and Young's modulus; overlaps with the Properties of Matter questions students often skip.
• Work, Power and Energy: work energy theorem and conservation; a core mechanics chapter that supports several others.
• Centre of Mass and Collision: momentum conservation and collisions; the companion to Laws of Motion and Rotational Motion.

Notice what Tier 2 is not: it is not a list of weak chapters. Several Tier 2 chapters, like EM Waves and Units and Error, are among the highest return chapters in the whole syllabus. The tier is about order, not value. Tier 1 first because it carries the paper; Tier 2 next because it completes it.

Tier 3: Leave These for the End

Tier 3 chapters are the last ones to do: Waves and Sound, Gravitation, Calorimetry, Heat Transfer, Magnetism and Matter, and the combined translation plus rotation section of rigid body motion. Last does not mean never. It means these come after Tier 1 and Tier 2 are secure, and they are the first to be cut if time runs out.

Gravitation sits in Tier 3 for a deliberate reason, and the reason is worth hearing because it changes how you revise it. ABJ Sir places Gravitation here because a student who has done Electrostatics can largely do Gravitation questions already: the structure transfers, with the constant replaced and the signs adjusted, while the formulas stay the same. Keeping it last is therefore not a judgement that Gravitation is unimportant. It is a scheduling trick: do Electrostatics first, and Gravitation largely takes care of itself afterwards.

The same thinking applies to the combined translation plus rotation section, which appears in Tier 1 discussions as the skippable part of Rotational Motion and again here as a Tier 3 item. Only the advanced section is Tier 3, not the whole of Rotational Motion. The base chapter is Tier 1 and compulsory; the advanced rolling and angular section is Tier 3, to be attempted only after everything else is secure. Holding both facts at once is the difference between skipping a chapter and sequencing it.

High Marks in the Least Time

Not all chapters cost the same time, and the cheapest marks in Physics come from small topics with short lectures and only two or three question types. These are the chapters to reach for when time is short, and the reason is visible in the numbers: a handful of hours for a fixed block of marks, with almost no variation in what gets asked.

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The pattern across all five rows is the same, and it is worth naming: the question types do not vary much. EM Waves keeps returning to the same relation. Semiconductors keeps returning to logic gates. Nuclear physics, after its removals, is a small set of direct formula questions. When a chapter has only two or three question types, mastering it is a short job, and the marks behave like fixed income rather than a gamble. That is why these chapters belong in every short time plan, even though none of them is large.

One caution applies to the whole table. The hour figures are ABJ Sir's estimates for a student starting the topic fresh, not guarantees, and they assume lectures plus basic practice, not mastery of every variation. Treat them as ordering information: EM Waves before semiconductors, nuclear physics before a large chapter, and Units and Error at any spare moment.

The 12 Experiments NTA Keeps Asking

Experimental skills deserve their own section, because students treat them as theory and NTA treats them as questions. The session works from a list of 12 experiments on which NTA regularly asks, and the questions are quick: once the set-up is known, most of them are solved in about a minute to a minute and a half. The catch is that the experiment question also needs the concept of its parent chapter, so experiments cannot be memorised as isolated facts.

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The NCERT connection matters here more than anywhere else. The diode graphs, the pendulum set-ups, and the bridge circuits are asked the way NCERT presents them, which means the textbook itself is the preparation for this section. Students who revise experiments from NCERT graphs and set-ups, rather than from scattered notes, will recognise these questions on sight. That recognition is the whole game in a section where each question takes about a minute.

The Two Round Method for 55 to 60 Minutes

Strategy inside the paper matters as much as strategy before it, and the method here is precise: Physics in about 55 to 60 minutes, in two rounds, with question selection as the core skill. The paper gives you 25 questions and the clock gives you roughly two minutes each on average. The method refuses that average and replaces it with two different speeds.

Attempt every Physics paper in two rounds

Round one is a selection exercise before it is a solving exercise. Go through the 25 questions and pick out the ones you can finish within about 90 seconds. Those are attempted first. Any question that looks like three or four minutes of work is not attempted yet; it goes to round two. The method works because it protects you from the classic failure: spending six minutes on one hard question while three easy ones sit untouched at the end of the paper.

Two supporting habits make the method work. First, practise with a fixed time frame every time, not just in mocks, so that timed solving becomes the default rather than a special occasion. Second, give the integer section the same respect as the multiple choice section. Students often take integers lightly and under practise them, yet all five carry marks and negative marking. For integers, PYQs are the strongest preparation, and unique PYQs in descending order, most asked first, are the most efficient form of it: if a chapter has 60 unique questions and time is short, doing the top 30 still covers the most repeated patterns, because the top of the list is by definition the most asked.

Mistakes That Cost Physics Marks

Most Physics marks are not lost to unknown concepts. They are lost to planning errors that repeat every year, and every one of them is visible in the analysis above. Read this table as a checklist against your own preparation, and fix the rows that describe you before January.

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If one line from this guide stays with you, let it be this: Physics rewards the student who covers everything in the right order and attempts the paper in two rounds. Tier 1 first, Tier 2 next, Tier 3 last, quick marks whenever time is short, experiments from NCERT, and 55 to 60 minutes of disciplined attempting. That is the whole plan, and it is enough for 90.

Three Tools for the Months Before January

The tier lists tell you what to study. These three tools decide how well the study converts into marks: unique PYQs in descending order, chapter-wise PYQs with video solutions, and full mocks under exam conditions.

None of these tools replaces the tier plan. They are how the plan gets practised: unique PYQs in descending order for the most asked patterns first, chapter-wise PYQs for the chapter you just finished, and mocks for the two round method itself.

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