The admission in IIMs is done in two levels. The first is to appear in CAT and qualify the test. IIM Admission Criteria 2016 includes short listing of candidates and then appearing for PI and WAT

Total IIM CAT Seats – IIMs seats for PGP and related courses-

IIM GN OBC SC ST Total Seats
IIM Ahmedabad 194 104 58 29 385
IIM Bangalore 193 103 57 29 382
IIM Calcutta 233 125 69 35 462
IIM Lucknow 211 113 63 32 419
IIM Indore 226 122 68 34 450
IIM Kozhikode 189 102 56 28 375
IIM Shillong 60 32 18 10 120
IIM Ranchi 60 32 18 10 120
IIM Rohtak 60 32 18 10 120
IIM Raipur 60 32 18 10 120
IIM Trichy 52 28 15 7 102
IIM Udaipur 60 32 18 10 120
IIM Kashipur 46 25 14 5 90
TOTAL 1644 882 490 249 3265**

** There were 3265 seats in 2013.
This was increased to 3335 in 2014. The seats in IIMs for 2016-2018 admissions will be published after CAT results.

The number of seats in IIMs has increased steadily over the past few years.