Hii can u inform me if you were able to change subject in 12th or not.

Hello Upadhyay Shivangi, it's totally dependent upon you, that which subject you want to study. Please, choose the subject according to your choice and passion, not because of any pressure. As bio is also a good subject and has a vast line-up, through which you can make your career.

Hello aspirant,
This is a very crucial desicion.
Decisions like these are usually taken in the begining or in the midfle of the 11th standard.
It is okay if you want to change your subjects in 12th standard even if it is late.
You need to talk to your school for this matter.
You need to pay some fees for this.
The fees maybe around 2-3000.
Again, you have to talk to your school.
Studies will be difficult.
All the best.