IMS SIMCAT and Career Launcher CLAT mocks are the two best mock series for CAT preparation targeting IIM ABC, per the three AMA hosts who explicitly said "One says IMS and one says CL, but that is just personal preference." Both have extensive question banks, accurate difficulty calibration, and national-level percentile indicators. IMS has slightly trickier VARC and less tricky QA; CL leans opposite.
For 99.9+ aspirants targeting ABC (where CAT cutoff is 99%+), taking one full series plus select mocks from the other gives cross-coverage. At IIM Ahmedabad (Rs 27.
5L fees, Rs 35.22 LPA avg), the prep investment is around Rs 10-20K for mock subscription - negligible against the Rs 35+ LPA outcome. Practical advice: take 25-30 full mocks in the 4 months before CAT, analyse each for 90+ minutes, and track sectional percentiles.
Target mock percentile: 98+ by August, 99.5+ by October. The three AMA hosts scored 99.
93/99.93/99.94 - they stressed that analysis of mocks matters more than volume.
Supplement with Anastasis Academy for DILR (one host recommended "at least a set a day") and Arun Sharma/Nishit Sinha books for QA concept revision. Skip mock series that don't have large enough pools (under 50K takers) since percentile calibration gets unreliable. Check your eligibility at collvera.