hi bhupesh

chose the subject you are most intersted in . in bsc first year you have to study all subjects but since you are from bio stream you will face difficulty in getting maths as a honours subject or subsidiary .try chosing a subject so that you have all three subjects /pcm  . i am a bsc physics honours students and i have studies pcm in my first year . about 60-70 % of bsc first year is from 11 and 12 th so you can prepare easily for semester exams . also remeber you will have only about 40 days to prepare for jee advanced after jee mains .

Hi Bhupesh !  So you want to ride two boats at a time. Not a cool idea. Basically you are playing safe, you don't wanna lag for one year. Bro! trust me there is no problem if you take one year drop to prepare for JEE ADVANCED. In my view you should devote your full time in JEE preparatuon.