1) First round was of GD where 30 students were selected 2) Second Round was of Aptitutude Test 3) Third round was of Technical Round and thereafter we were provided with the offer letters

It includes 2 rounds (Aptitude Test followed by Technical Interview). Aptitude Questions will mainly include questions related to non verbal reasoning for e.g series questions , Problem Figure and Answer Figure so would suggest to study from R.S. Aggarwal Reasoning book