For BSc, the combination of subjects usually differs from colleges to colleges.
Some of the combinations that you can apply with physics, chemistry and biology in 12th standard are :-
These are the usual subject combinations in various colleges for first year of BSc.
Choose where your interest lies the most. The subjects in second year to be taken are 2 and then in third year one subject.
If you still have any queries feel free to ask in the comment section down below.
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