Hello,

You can join IISER after completing BSc. You can apply for the integrated PhD programs offered at IISERs. The eligibility criteria for the same is to have a minimum of 60% marks in BSc. You can also apply by securing ranks below 800 in IIT JAM entrance test.

Check out the official website for more details regarding the eligibility criteria :

http://www.iiserpune.ac.in/admissions/int-phd-programme