Strategy

Score 73+ by taking the paper in the right order

25 questions × 4 marks = 100, with 1 mark lost for each wrong answer, on a clock shared with Physics and Maths. Chemistry is the section where many questions are answered on sight, so the plan is about order: what to answer first, what to calculate after, and what to guess.

marks out of 100: 73+
questions attempted: 22/25
accuracy on those: 86%
of the shared clock: ~50 min

The arithmetic of 73+

22 attempted questions at 86% accuracy is 19 right and 3 wrong: 19 × 4 − 3 = 73 marks. The other 3 are not simply left blank. Every multiple-choice question among them still gets an answer at the end, because a guess there is worth more than a blank:

Expected marks from guessing a JEE Mains Chemistry question, by format and by options still in play
Question	Expected marks from a guess	Verdict
MCQ, 4 options left	+0.25	A blind guess still pays on average. Never leave an MCQ blank at the end.
MCQ, 3 options left	+0.67	Rule out one option and the guess is worth two-thirds of a mark.
MCQ, 2 options left	+1.5	Down to two, a guess is worth more than a mark.
Numeric answer	close to −1	A numeric answer has no options, so a guess is almost never right and still costs a mark. Enter one only when you have worked it out.

So the formats split. The physical chapters hold 55% of the numeric answers, and a numeric answer is worth something only when you can finish it. Those chapters must be owned, not half-learned. A multiple-choice question is worth something even when you cannot finish it, and more once one option is ruled out on sight.

The shared clock

180 minutes cover all three subjects, and every question pays the same 4 marks. The plan below is a starting budget of about 50 minutes for Chemistry, not a measurement; adjust it from your own mock tests.

1
Give Chemistry less time than Maths
The three subjects share one clock. Many Chemistry questions are answered on sight, so Chemistry can fund the other two. Start from the budget above and adjust it from your own mock tests.
2
First sweep: everything you can answer on sight
Go through all the Chemistry questions once. Answer the reactions, facts and orders you know, and mark the calculations and anything that needs thought.
3
Second sweep: the calculations
Come back to the marked calculations. Write the formula, carry units and powers of ten, and check that the answer is sensible before entering it.
4
Last minutes: fill every MCQ
Any multiple-choice question still blank gets an answer, after ruling out what you can. Numeric answers you have not worked out stay blank.

The formats the paper reuses

A few question formats turn up in every chapter. Each has a way of working that saves time and marks.

How to work each question format on the JEE Mains Chemistry paper
Format	How to work it	Why
Two statements	Judge each statement on its own, as true or false, before you read the four combinations. Then pick the one combination that matches.	The options pair the statements every possible way, so reading them first only invites a guess. One statement judged wrong sends you to the wrong option.
Match the list	Fix the one pair you are surest of and strike every option that breaks it. Then fix a second pair among what is left.	Two certain pairs usually leave one option. Working through all four pairs in order wastes time on the pair you do not know.
How many of the following	Mark each item yes or no on the page, then count the marks. Never count by eye or by pattern.	Most numeric answers outside physical chemistry are counts like this. One item judged wrongly makes the whole answer wrong, and a wrong numeric answer still costs a mark.
A numeric answer	Round only at the end, check the unit the question asks for, and enter the integer it asks for.	There are no options to check against. A slip in a power of ten or a unit is a wrong answer.

Calculate — 7 chapters, 9.1 questions a paper

Chapters where 40% or more of the questions are calculations.

Physical chemistry. Most of its questions need arithmetic, and most of the paper's numeric answers come from here.

The approach

Learn each chapter's few working formulas until you can write them without looking. Most questions apply one or two of them in order.
Carry units and powers of ten through every line. A numeric answer is entered as an integer, so a slip in an exponent is a wrong answer.
Take these questions in the second sweep, after everything you can answer on sight.
Check that the answer is sensible: a negative concentration, a pH above fourteen or a rate that falls when it should rise means a slip.

Some Basic Concepts of Chemistry

1.50 a paper in 2025–26 · 1.48 in 2021–24 · 72% calculation · 54% numeric

Chapter	Questions	2025–26	Last set
Organic Reaction MechanismsFunctional-group tests and mechanism questions that span the organic chapters. Small on the recent papers; its notes are worth a read once the reaction chapters are done.	48	0.27	2026
The s-Block ElementsLeft the syllabus	88	0.11	2026
General Principles and Processes of Isolation of ElementsLeft the syllabus	74	0.05	2025
PolymersLeft the syllabus	46	0.03	2025
Environmental ChemistryLeft the syllabus	65	0.00	2023
HydrogenLeft the syllabus	64	0.00	2023
Surface ChemistryLeft the syllabus	64	0.00	2024
Chemistry in Everyday LifeLeft the syllabus	49	0.00	2023
Solid StateLeft the syllabus	33	0.00	2024

The arithmetic of 73+

The shared clock

The formats the paper reuses

Calculate — 7 chapters, 9.1 questions a paper

Reactions — 5 chapters, 5.4 questions a paper

Structure and recall — 7 chapters, 10.0 questions a paper

The rest of the bank

Own the 7 Calculate chapters