When should candidates start full-length CAT mocks and complete the QA syllabus?

Arithmetic done by August end, full-length mocks starting immediately after: that is the only timeline that gives you a realistic shot at IIM Ahmedabad, Bangalore, or Calcutta. Waiting until the entire QA syllabus is "complete" before touching mocks is the single most common mistake that costs students 10-15 percentile points in November.

Why August Is the Hard Deadline for Arithmetic

Arithmetic forms roughly 35-40% of the QA section in recent CATs. Topics like ratio and proportion, percentages, time-speed-distance, and mixtures appear in clusters.

If you clear these by late August, you have September and October to layer in algebra, number theory, and geometry without abandoning mock practice. Miss this window and you end up cramming topics in October while your mock frequency collapses.

That is a losing trade.

With roughly 111 days to CAT from late July, the math is unforgiving. You need approximately 20-25 full-length mocks before exam day to see meaningful score stabilisation.

That means one mock every four to five days, minimum. Starting in October leaves you with maybe 8-10 attempts.

That is not enough.

Which Mock Series to Use

CL (Career Launcher) combined with either SIMCAT (IMS) or AIMCAT (TIME) gives you the best spread. CL tests tend to have slightly tougher VARC, while SIMCAT difficulty on QA tracks closer to actual CAT patterns from 2021-2023.

DASHCAT is a newer addition with adaptive difficulty that a growing number of 99-percentilers have credited in post-exam reviews. Do not stick to a single series.

Cross-series exposure is what stops you from gaming a particular question style.

The percentile scores on mocks are not directly comparable to actual CAT percentiles. A 92 on SIMCAT does not equal a 92 on CAT.

What matters is your score trajectory across 6-8 consecutive mocks, not any single number.

IIM Calcutta's cutoff has historically hovered around 98-99 overall, with section minimums near 85-90.

IIM Bangalore and Ahmedabad are similar. You need sustained mock performance, not a few lucky outliers.

How to Use Mocks Without Burning Out

One full mock per attempt, two days of analysis after, and one topic revision day before the next mock. That three-day cycle is sustainable for twelve weeks.

Analysis means reviewing every wrong answer and every question you guessed correctly. Random right answers are a liability: they inflate your mock score but collapse on exam day.

Sectional mocks can supplement but should not replace full-lengths. The cognitive fatigue of a three-hour CAT is itself a skill.

IIM Ahmedabad's selection process rewards consistent 99-percentile performance, not subject-specific brilliance. You need to simulate that full-length stamina repeatedly.

The Uncomfortable Truth

If you are reading this in September and have not started mocks yet, you are behind. This is not a reason to panic, but it is a reason to be brutally honest about your prep calendar.

Dropping one or two lower-priority QA topics (advanced permutation-combination or complex number theory) to protect mock frequency is the right call.

The IIMs do not reward those who finished the syllabus: they reward those who performed under pressure on exam day.