the selection exam is done in 2 rounds namely the written part and the interview in which the studnets has to have command on english, maths, general knowldge and hindi as well as reasoning, at 10+2 level.

the syllabus of all the concerned subjects is in the link below kindly refer to it

https://www.current-affairs.org/5938/pgimer-chandigarh-syllabus-2017-pgimer-sr-resident-medical-officer-exam-pattern

although the criteria might differ a bit from place to place and institute to institute.