Physics and Chemistry carry 180 marks each on the NEET paper. Put them together, and they match Biology’s entire 360-mark share. Yet most September study plans treat them as an afterthought — or worse, run them on the same playbook that works for Biology. Read the chapter, highlight a few lines, tick it off, move on. That method collapses fast in Physics and Chemistry, because neither subject rewards memory the way Biology does.
September is the month to correct this, and the timing isn’t accidental. October and November bring full-syllabus mocks, test-series pressure, and school or coaching deadlines stacking up. There’s far less room then to slow down and rebuild a weak foundation. Right now, there is. What you set up over the next few weeks decides whether Physics and Chemistry become your rank-deciders or the two subjects you quietly hope Biology will cover for.
Why Physics and Chemistry Need a Completely Different Revision Method
Biology mostly asks you to recognise something you’ve already read. The question shows you four options and one of them matches a line from NCERT. Physics and Chemistry ask you to do something with a concept — solve a numerical, apply a formula to an unfamiliar setup, or push a reaction through three steps to a product nobody handed you.
This distinction matters more than students expect. Rereading a Physics chapter without solving anything from it teaches almost nothing that transfers to the exam hall. A formula can look completely obvious sitting on the page and still fall apart the second it meets a question phrased in a way you haven’t seen. The gap between “I understand this” and “I can produce this under time pressure” is the entire game in these two subjects, and it only closes through solving.
So the September shift is simple to state and hard to actually do: stop measuring progress in chapters read, start measuring it in problems solved.
Physics Strategy: Start With the Highest-Weightage Chapters
Physics has 45 questions on the paper, and a handful of chapters have consistently accounted for a disproportionate share of them across recent papers. Starting September with these — rather than working obediently in textbook order — means your highest-impact topics get the most repetition time before the calendar tightens.
- Motion of System of Particles and Rigid Body tends to carry the single largest share, close to seven percent of the paper on its own
- Current Electricity, Semiconductor Electronics, and Thermodynamics each regularly contribute around six percent
- Ray Optics and Optical Instruments and Electrostatics add another meaningful chunk most years
- Mechanics as a whole underpins a large slice of Class 11 Physics questions, so weakness here leaks into everything downstream
These weightages aren’t guaranteed to repeat identically — NTA doesn’t publish an official chapter split, and every year shifts a little. But they’ve stayed reliably high across several papers, which is enough to justify sequencing your September around them.
One caution worth naming: high weightage is a reason to start with a chapter, not a reason to skip the rest. Students who chase only the top chapters routinely lose four or five marks to the “small” ones and never understand where the rank went.
Chemistry Strategy: Three Subjects Wearing One Name
Chemistry isn’t one subject for revision purposes. It’s three — Physical, Organic, and Inorganic — and each demands a different kind of attention, a different daily rhythm, and honestly a different mindset.
Physical Chemistry is concept- and numerical-heavy. Chapters like Chemical Kinetics and Equilibrium need genuine problem-solving practice, not formula memorisation that evaporates under exam conditions. Organic Chemistry carries the largest individual share of the subject, and chapters like Aldehydes, Ketones and Carboxylic Acids, along with Basic Principles of Organic Chemistry, reward small daily reaction practice far more than one heroic weekend of mechanism cramming. Inorganic Chemistry sits closest to Biology in style — largely NCERT-based recall — but Chemical Bonding specifically carries unusually high weightage and deserves far more than the quick skim it usually gets.
- Give Physical Chemistry regular numerical practice, not just theory review
- Practise Organic reactions daily in small doses rather than cramming mechanisms all at once
- Treat Inorganic Chemistry, especially Chemical Bonding, as close NCERT reading, not casual revision
- Keep the three sections separate in your study log, since progress in one doesn’t mean progress in the others
- Rotate across all three each week instead of finishing one completely before touching another
That last point is where most students go wrong. Finishing all of Organic before opening Physical feels efficient and organised. It also means that by the time you circle back, the first section has gone cold and needs relearning.
Build a Formula Bank and Reaction Bank This Month
September is the right time to start a running formula sheet for Physics and a reaction bank for Organic Chemistry — both compiled from scratch, not copied wholesale from a senior’s notes or a downloaded PDF.
The compiling is the studying. Writing out a formula yourself, alongside the two or three question types it typically applies to, builds a different quality of memory than reading it off a printed sheet ever will. Same logic for Organic reactions: note the reagent, the product, and one tricky variation for each, rather than just the bare equation.
- Add a formula or reaction the same day the topic is studied, not days later from fading memory
- Keep Physics formulas and Organic reactions in two separate running sheets, never mixed
- Note the specific question type each formula applies to — a formula without context is easy to misapply
- Review the growing sheet once a week, not only during a final revision panic
Maintained chapter by chapter through September, this becomes the single fastest revision tool you own come December — vastly quicker than reopening the full NCERT chapter every time.
How to Use AI to Strengthen Physics and Chemistry Prep
An AI-powered layer fits Physics and Chemistry better than almost any other part of NEET prep, because both subjects are about volume of varied practice — and generating varied practice is exactly what AI is good at.
- Unlimited variation on one weak concept. Ask for fifteen NEET-level numericals on rotational motion alone, at increasing difficulty, instead of hunting through a book for five.
- Step-by-step error diagnosis. Paste your working, not just your answer. A good AI tutor will tell you whether you broke down at the concept, the formula selection, or the arithmetic — three very different problems.
- Organic mechanism drills on demand. Ask it to generate reagent-to-product questions from a chapter and explain the mechanism when you miss one.
- Adaptive weak-area tracking. An AI-driven test platform can surface which chapters your accuracy is actually dropping in, which is usually not the chapter you think.
- Formula sheet interrogation. Feed in your own sheet and ask it to quiz you on application, not recall.
The non-negotiable caveat: verify AI-generated Physics numericals and Chemistry mechanisms against NCERT or a standard reference. Use it to multiply your practice volume and diagnose your gaps — not as your source of truth.
Don’t Postpone Numericals Just Because It’s Early
There’s a strong temptation in September to stay on theory. The exam still feels distant, numericals feel heavy, and postponing them feels harmless. That instinct costs more here than it would in Biology.
Numerical fluency in Physics and Physical Chemistry builds slowly, through repetition spread over months — never through a compressed sprint in March or April. A chapter read thoroughly in September but never solved will have to be relearned from a problem-solving angle later anyway, which means paying for it twice. Solving even a small fixed number of questions per chapter now, daily, saves genuine weeks later.
Physics and Chemistry reward a different kind of September than Biology does. Less careful reading, more early repetition — on formulas, on reactions, on numericals — while there’s still enough calendar left for any of it to stick.
Key Takeaways
- Solve, don’t reread. Progress in these two subjects is measured in problems attempted, not chapters covered.
- Sequence Physics by weightage. Rigid Body, Current Electricity, Thermodynamics, Semiconductors, and Electrostatics first — textbook order second.
- Split Chemistry into three and rotate weekly. Physical gets numericals, Organic gets daily reactions, Inorganic gets close NCERT reading.
- Start the formula and reaction banks now, in your own handwriting. This one habit compounds harder than anything else on the list.
- Do numericals daily, even a small number. Fluency accrues over months; it cannot be purchased in April.
This blog is for general guidance. Chapter weightage reflects trends from recent NEET papers and can shift year to year — always verify the current syllabus and exam pattern on the official NTA website.