Hello aspirant,

Yes, there is always a possibility. If your session just started or it's been less than 2 months then you can still change your stream but if you gave your half-yearly exams then the chances are very low. You can even take both maths and biology if you are not sure about one stream. Make sure that you are still studying. After the 12th completion, you can go for any streamline as you wish. If you took PCB on the 11th and want to change to the 12th then you can also do so please contact your school office and look for further guidelines that need to be followed.

Thank you