but I don't have computer in my +2 group I only have physic chemistry maths and boilogy can I take bsc computer science after +2
Dear applicant even if you didn't have computer science in your 10+2 then also you can pursue B.Sc Computer Science course. This is because the general eligibility criteria of B.Sc Computer Science course is you should complete your 10+2 from any recognised institution with Science stream as your subject combination( Physics, Chemistry, Mathematics or Biology or Computer Science ) so yes you can pursue it.
Hope it helps!!!