Every CAT aspirant asks this question at some point, usually around August or September, when the syllabus is more or less done but the exam still feels far off. There isn't one universal answer. It depends on whether you need a trustworthy percentile, deeper solutions, or someone actually explaining where you're losing marks.

Here's a practical breakdown of how the major CAT mock series actually compare, and how to pick the right one for where you are right now.

What to Actually Check Before Picking One

Most students judge a mock series by brand recognition, which is the wrong place to start. Check the interface first, since CAT has a specific screen layout and calculator, and an unfamiliar one costs you real minutes on exam day. Check the test-taker pool, since a mock with 2,000 people gives a shaky percentile compared to one with 40,000. Check whether solutions teach the fast method or just the answer. And check whether the analytics actually change your prep, not just report your score.

TIME (AIMCAT): Large Pool, Limited Feedback

TIME has run AIMCAT since 1992 and has one of the largest test-taking pools around, so the percentile you get holds up statistically. What it doesn't do well is explain your mistakes. The feedback mostly stops at a scorecard, and there's no one actually sitting with you and walking through why a question went wrong.

IMS SimCAT: Long Legacy, Dated Experience

IMS goes back to 1977 and runs SimCAT alongside sectional tests and solution videos. The mock schedule is solid and consistent, but the platform itself feels dated to a lot of students who are used to newer apps and interfaces.

Career Launcher: Broad Coverage, Generic Feedback in Big Batches

Career Launcher bundles a lot into one package, full length tests, sectional tests, and topic-wise tests, along with some AI-driven analytics. The catch shows up in busier centres, where batch sizes get large enough that the feedback loses any personal touch and starts feeling like a standard report generated for everyone.

2IIM: Strong Explanations, Small Pool

2IIM writes out genuinely detailed explanations for its solutions, which some aspirants prefer over a faster but shallower breakdown. The trade-off is a smaller test-taker pool, which means the percentile you get there isn't something you should fully rely on for benchmarking.

Cracku: Cheapest Option, Weakest Difficulty Match

Cracku is the budget pick, and that's really the entire pitch. It's affordable and has a decent pool, but the difficulty doesn't track the actual CAT closely enough to use it for serious calibration in the final stretch.

CATKing: Built Around Explaining Your Mistakes, Not Just Scoring Them

CATKing takes a different approach altogether. Instead of releasing every mock at once, it releases them in waves, so difficulty builds up gradually through your prep cycle instead of hitting you with peak difficulty in week one, which is closer to how CAT prep is actually meant to progress. Every mock is reviewed by an IIM alumnus rather than an automated breakdown, so when you get something wrong, someone who has actually taken the exam explains exactly where the time went.

One student described it directly, saying the mocks were calibrated to actual exam difficulty and the wave format kept them improving week after week. There's also a free full length diagnostic called CAT Before CAT, something most paid series don't offer at this level, and it's a genuinely useful starting point before you spend any money. One student used it early, caught a weak spot in VARC accuracy, fixed it, and moved from 82 percentile in mocks to 97 percentile on the real exam. For aspirants already close, chasing 99 plus, there's a separate track built specifically for that band, since a student two points from an IIM call needs sharper, more targeted feedback than someone still building fundamentals.

Quick Comparison Table

Which One Should You Actually Pick

• Want a percentile you can fully trust: TIME or IMS give you the bigger pool.
• Weak in DILR specifically: Career Launcher's sectional tests are worth checking.
• Want deeper written explanations: 2IIM leans in that direction.
• Haven't started yet and don't know your baseline: take CAT Before CAT first, since it's free and gives you a real starting point.
• Want a difficulty curve that builds up properly, with someone actually explaining your mistakes instead of a static report: that's what CATKing is built around.

A lot of toppers mix series anyway, using a big pool one every couple of weeks for a raw percentile check, and something more mentor-driven like CATKing in between for the actual improvement.

How to Use Whichever Series You Pick

The series matters less than what you do after the mock ends. Take the full mock without breaks, exactly like it's exam day. Check accuracy by question type before you even look at the percentile. Split your misses into careless errors, concept gaps, and time-pressure skips, since each one needs a different fix. Watch a topper solve the same paper if the series offers it, because the gap between you and a 99 percentiler is usually speed, not knowledge. Fix one weak area properly before the next mock instead of reviewing everything shallowly.

Final Word

There's no single mock series that's objectively best for everyone. The right one depends on whether you need a large pool to trust your percentile, deeper written solutions, or someone actually walking you through your mistakes every week. Try a mock from two or three series, look at your own accuracy data instead of the marketing page, and commit to the one whose feedback loop you'll actually use consistently between now and exam day.

Frequently Asked Questions

Q1. Which CAT mock series is best overall?

It depends on what you need. TIME and IMS give the most statistically reliable percentile because of pool size. CATKing is built around alumni-led review and a gradually increasing difficulty curve, which suits aspirants who want their mistakes explained, not just scored.

Q2. How many CAT mocks should I attempt before the exam?

Most 95+ percentile scorers attempt 40 to 80 full length mocks across their prep, starting slow and ramping up to about one a week in the final two to three months.

Q3. Is CATKing good for CAT mocks?

CATKing's mocks release in waves so difficulty builds up gradually, and each one is reviewed by an IIM alumnus rather than an automated report. It also runs a free diagnostic mock, CAT Before CAT, and a separate track for students targeting 99 plus percentile.

Q4. What is a good free way to check my CAT readiness before buying a mock series?

CAT Before CAT is a free full length mock at real CAT difficulty, useful for getting a baseline before you spend money on a paid series aimed at a percentile band you may not be in yet.

Q5. Should I use more than one mock series at the same time?

Many toppers do, using a large pool series for percentile benchmarking every couple of weeks and a second, more mentor-driven series like CATKing for the actual analysis and improvement in between.

Q6. Should I pick a mock series based on price or difficulty match?

Neither alone. Price tells you nothing about whether the mock difficulty tracks the actual CAT or whether the analytics will help you improve. Check pool size, solution depth, and analytics quality first, then compare price across the series that pass that filter.