Yes you will have to pass the DGCA Tech specific exam for them to endorse on your license
its quite likely that your previous hours on the C152 wont be counted anymore since its been more than 5 years you have flown one
You will need to undergo a total of 7 hours of flying which includes the skill tests
http://www.dgca.nic.in/cars/D7B-B18.pdf
Please get the apply and obtain DGCA admit card approved as well before giving the July attempt