How to analyse a JEE Main mock test using an error log

Short answer: your mock score tells you how much went wrong, not what went wrong. An error log fixes that. After every mock, sort each question you got wrong (or guessed), name the type of mistake, and fix one cause a week. The template below takes about 40 minutes per mock to fill in.

Why the score alone misleads you

Two students can both score 140 in a mock and need completely different fixes. One lost marks to concepts they never learnt; the other knew everything but ran out of time. The score hides that difference.

The score also hides lucky guesses. A guessed answer that happened to be right adds four marks today and costs you on exam day, when the same guess goes the other way.

Step 1: Sort every question into four groups

Go through the paper question by question and put each one into exactly one group:

Group	What it means	What to do
Correct and sure	You knew how and why	Nothing. Move on
Correct but guessed	Right answer, shaky reasoning	Treat it as a mistake and log it
Wrong	Attempted and got it wrong	Log it
Skipped	Didn't attempt	Log it only if you should have been able to do it

The second row matters most. Students who count guessed-correct answers as "done" keep finding the same weak chapters in every mock.

Step 2: Name the mistake type

Every logged question gets one of four types. Be honest: the type decides the fix.

Concept: you didn't know the idea, or applied the wrong one. Fix: re-learn the idea, then solve 10–15 questions from that chapter.
Calculation: right method, wrong arithmetic, sign or unit. Fix: slow down at the step where it broke; see our guide to avoiding silly mistakes.
Reading: you solved a different question from the one asked (missed "NOT", "incorrect", "minimum", or a unit in the options). Fix: underline the asked quantity before solving.
Time: you could have solved it but didn't reach it, or rushed it. Fix: practise question selection: first pass for the quick ones, second pass for the rest.

If a mistake fits two types, pick the earliest one in the chain. A sign error caused by not knowing the sign convention is a concept mistake, not a calculation one.

Step 3: Fill in the error log

Use a notebook, a spreadsheet or the table below. One row per logged question.

Q no.	Chapter	Type	What went wrong	Fix	Retest on
14	Current Electricity	Concept	Took the cell's EMF as −E while moving from its − terminal to its + terminal in a Kirchhoff loop	Rule: crossing a cell from − to + is a rise of +E; crossing a resistor along the current is a drop of −IR. Redo 10 loop questions	Next Sunday

The row above is a made-up example to show the level of detail. Write "what went wrong" specifically enough that you'd recognise it again.

Step 4: Turn the log into a weekly fix

The log is only useful if it changes what you study:

Count by chapter and type at the end of each week. The biggest cell (for example, "Current Electricity × Concept") is next week's priority.
Fix one cause per week. Trying to fix everything at once usually fixes nothing.
Retest the same type of question, not the same question. If you got a Kirchhoff loop wrong, solve fresh loop questions on the retest date. Re-reading your own solution doesn't count.
Close the row only when you get the retest right without help.

How many mock tests should you take?

There's no single right number. It depends on how much of the syllabus you've finished. If you're following our 12-week plan:

Weeks 1–6: one full mock every two weeks. You're still repairing chapters, so the log matters more than the score.
Weeks 7–10: one or two full mocks a week, each followed by the error log.
Weeks 11–12: two or three mocks, then a light final week.

A mock you don't analyse is mostly practice at sitting still for three hours. If you're short of time, take fewer mocks and analyse every one.

A 40-minute routine after each mock

10 minutes: sort every question into the four groups.
20 minutes: fill in the log for the wrong, guessed and should-have-done questions.
10 minutes: count by chapter and type, and write next week's one fix at the top of the page.

Do it the same day, while you still remember why you chose each answer.

Practise the chapter your log points to

Once the log names a weak chapter, the next step is understanding it properly rather than re-reading notes. ErodovAI's tutor explains each step with voice and a whiteboard, and you can ask the same doubt again until it makes sense. See the JEE Main Physics course, or all three subjects together.

This is general study guidance, not a promise of any score or rank. Check the current exam pattern and marking scheme in NTA's information bulletin at jeemain.nta.nic.in.