Question

which subject i have to study in class 11

Answer 1

you have to choose streams.

PCM

PCB

Commerce

Arts

Answer 2

Its depend on what you want to become.

Suppose you want to become Doctor you have to take science stream.

If u want to be a CA, you have yo take commerce site

And if you want to became IAS you can take arts site.

So, it's your life enjoy it and do only what you like to do.