You have an option to choose any of the combination either PCMB or PCB.

If you take PCB combination then see which subjects the college you want to take admission in are offering with PCB. If you are ready to study those particular subjects well then choose PCB.

Otherwise if you don't want to study that particular subjects offered by the college along with PCB then go for PCMB.

At the end of the day your focus must be on Physics, Chemistry, Biology.

The other subject you can choose according to your willingness to study those subject because in Boards all of them will be important as Boards Score is important.

If you still have any queries feel free to ask in the comment section down below.