Hi shiv Kumar ..

Hope you're doing great

Yes ,you can do forensic science it is a vast branch for every student ,you can do bsc in forensic after 12 th PCM.With a little effort and a good knowledge of biology, you will be able to catch up soon in the forensic science stream.

You just need some efforts in biology but if you first first do bsc in particular subject of science then you do master is very well

Hope it helps