As per latest syllabus of CBSE the compulsory subjects for a Bio student are as given below-



1)PHYSICS

2) CHEMISTRY

3)BIOLOGY

4)ENGLISH

5)OPTIONAL- Any subject you like!



But for a science background especially that of PCB one must take an optional subject which is easy for the person to go with.

Let me tell you all the optional subjects too.

1- Sanskrit- bit easy (only if you are well versed with the basic concepts)

2- psychology

3-Economics

4-Hindi

5-Physical Education ( you have to do crunches and lunges)

6-Fine Arts

7-Maths ( for commerce and bio students)

8-Information Practices and C++



Choose a wise option :)