Joint Entrance Examination (Main)

JEE Main is conducted by the National Testing Agency as a computer-based test, in two sessions each year — normally one in January and one in April. You may sit both. Only your better result counts, so a weak first attempt costs you nothing but the effort.

Most candidates sit Paper 1, for B.E. and B.Tech admission. There are two further papers for architecture and planning, taken far less often.

Paper 1 in detail

Each of the three subjects is split into two sections. Section A is multiple choice with one correct option. Section B is numerical-value: you type an answer rather than pick one, so there is nothing to eliminate and nothing to guess from.

Section B used to offer ten questions of which you answered five. That choice was removed, so all five now count. Practise numerical questions as compulsory ones — you can no longer skip the two you dislike.

Marking is uniform across all three subjects and both sections.

What a wrong answer really costs

Students usually think of negative marking as losing one mark. It is actually a five-mark swing, because the four marks you would have got for the correct answer are also gone. Two sure answers plus one guess gives you seven; three sure answers gives you twelve.

So guessing only makes sense once you can genuinely rule out two of the four options. Below that, leaving the question is the better-scoring choice. Deciding when to leave a question is a skill you build in mock tests — it is not giving up.

Percentile, not marks

Your result is reported as a percentile score: the proportion of candidates in your session who scored at or below you. It is not a percentage, and it is not your marks. Because the two sessions use different question papers, percentiles are what makes them comparable, and a normalisation procedure accounts for any difference in difficulty.

If you sit both sessions, the better of the two NTA scores is used. Ranks are then drawn up from that score, with published tie-breaking rules.

JEE Main itself is open to almost anyone who has finished, or is finishing, Class 12. The stricter conditions attach to admission rather than to sitting the paper — a distinction that catches people out every year.

To sit the exam

• You must have passed Class 12 (or an equivalent qualifying examination), or be appearing for it in the current year.
• There is no age limit.
• You may attempt JEE Main in three consecutive years, both sessions of a year counting as one attempt.

To take admission at an NIT, IIIT or GFTI

Admission through JoSAA carries an additional academic requirement:

• At least 75% aggregate in Class 12 (65% for SC and ST candidates), or
• a place in the top 20 percentile of your own board in that year.

Either condition satisfies it; you do not need both. Class 12 must include Physics and Mathematics, plus one of Chemistry, Biotechnology, Biology or a technical vocational subject.

The JEE Main syllabus is built on the Class 11 and Class 12 NCERT curriculum in Physics, Chemistry and Mathematics. The topics are the ones you already meet at school; what differs is the depth at which they are asked.

Physics

Mechanics carries the syllabus and rewards the most work: kinematics, laws of motion, work and energy, rotation, gravitation. Beyond it sit thermodynamics and kinetic theory, oscillations and waves, electrostatics and current electricity, magnetism and electromagnetic induction, optics, and modern physics. Roughly a fifth of the paper is experimental skills, which candidates routinely neglect and then lose easy marks on.

Chemistry

Three parts that behave like three different subjects. Physical chemistry is calculation — mole concept, thermodynamics, equilibrium, electrochemistry, kinetics. Inorganic chemistry is structured memory, where periodic trends and the chemical bonding chapters do most of the work. Organic chemistry is mechanism: once general organic chemistry clicks, the named reactions stop being a list and start being consequences.

Mathematics

Calculus and algebra together dominate. Sets, relations and functions; complex numbers; matrices and determinants; permutations and combinations; sequences and series; limits, continuity and differentiability; integral calculus; differential equations; coordinate geometry; three-dimensional geometry; vectors; statistics and probability; trigonometry.

NTA has pruned the syllabus in recent years, removing some topics entirely. Work from the current official syllabus rather than an old book's contents page, or you will spend weeks on chapters that cannot be asked.

Most students get about two years for this. In our experience very few of them fall short because they did not put in the hours. They fall short because those hours went into reading instead of solving, and because the syllabus got covered once and then never seriously revised.

Finish NCERT properly before touching advanced books

NCERT is not a beginner's book that you outgrow. It sets the standard that questions are written against, and in Chemistry a large share of questions come almost straight from it. Do it line by line first. A student who is solid in the standard chapters will score better than one who has half-understood the difficult ones.

Solve with the book closed

You read a solved example, it makes complete sense, and you move on. Three weeks later the same question comes in a test and nothing comes to mind. This happens to almost everyone, and it happens because reading is not solving. Close the book, take a blank sheet, and write the full solution yourself. Whatever you cannot write is what you have not actually learnt yet.

Give full papers in one sitting

Three hours, no breaks, no phone. Chapter-wise practice builds accuracy, but only a full paper trains you to still be thinking clearly in the third hour and to decide the order in which to attempt. Marks lost in the last forty minutes are usually lost to tiredness and panic, not to anything you did not know.

Check why each mistake happened

After every test, put each wrong answer in one of three groups — did not know, knew it but misread the question, knew it but ran out of time. These are three different problems and only the first one is fixed by studying more. Students who maintain this list improve much faster than students who only keep attempting more papers.

Make your own short notes as you go

One page per chapter: formulae, standard results, and the specific mistakes you keep repeating. In the last month before the exam these notes are what you will revise from. You cannot sit and prepare them in March; if you write them along the way it takes almost no extra time.

Take the January session seriously

Since only the better of the two scores is counted, the January attempt is a full rehearsal that costs you nothing. Give it like the real thing, then use the result to decide where the remaining months should go.

Getting a good rank does not by itself give you a seat. Seats are allotted through a separate counselling process, and every year students with usable ranks lose out simply because they missed one of its dates.

JoSAA

The Joint Seat Allocation Authority allocates seats across the IITs, NITs, IIITs and other government-funded technical institutes in one combined process. You register, then fill an ordered list of institute-and-branch choices. Allocation runs over several rounds: at each round you either accept and freeze, accept but stay in the running for something higher (float or slide), or withdraw.

Fill your choice list in the order you would actually accept, not in the order you wish for. The allotment gives you the highest choice your rank reaches, so never keep a college above one you would genuinely prefer.

CSAB and state counselling

Seats left vacant after JoSAA go to CSAB special rounds. Separately, many states run their own counselling for engineering colleges using JEE Main ranks — these have their own domicile rules, their own deadlines, and no connection to the JoSAA calendar. If a state college is part of your plan, track that process yourself from the start.

What to have ready

• Class 10 and Class 12 mark sheets and certificates
• JEE Main scorecard and rank letter
• Category and PwD certificates in the prescribed format, where applicable
• Photo identity proof, and the seat-acceptance fee

A certificate in the wrong format counts as no certificate at all. Check the prescribed formats early, while there is still time to get one reissued from the issuing office.

Should I sit both sessions?

Yes, unless something prevents it. Only the better score counts, so the first session costs you nothing and tells you more about your readiness than any mock test can.

Does the January score disappear if April goes badly?

No. The higher of the two is used. A worse second attempt cannot pull you down.

How many attempts do I get?

Three consecutive years. Both sessions within a year count as a single attempt.

Is there negative marking on numerical-value questions?

Yes. Section B carries the same −1 as Section A. It did not always, which is why older guides say otherwise — do not calibrate your guessing on them.

Do Class 12 marks affect my rank?

They do not affect the JEE Main rank. They affect admission: NIT, IIIT and GFTI seats require 75% in Class 12 (65% for SC/ST) or a top-20-percentile place in your board.

What is the link to JEE Advanced?

JEE Advanced, for admission to the IITs, is a separate exam with its own syllabus and a much harder paper. A limited number of top JEE Main performers each year become eligible to sit it.

Is NCERT enough on its own?

For Chemistry it takes you a long way. For Physics and Mathematics it establishes the concepts but not the problem-solving range the paper demands, so pair it with serious question practice.