there are many options after 12th std.It depends on your field of interest.here are some options listed down.

deploma courses

bsc 

bcom

hotel managemnet

LLB

journalism

nursing 

physiotherapy

Hello deepansu,
If you have completed your 12th from PCM(Maths)
Then you have to choose engineering . If you ahve completed your 12th from Bio then you go to medical line.
You have to do preparation for both JEE MAINS and AIPMT according to your choice.
Thank you