It is very important question arises in mind of student when he/she is about to pass class-10th. So it solely depends on your aim that would you like to be in future.
If you want to be the scientist than you should go with field related to science. So you can opt for PCM (Physics, Chemistry, Maths) or PCB (Physics, Chemistry, Biology) stream in class 11th.
With these streams you can go for further higher studies which helps you in achieving your aim or target.
Hope you got your answer. We wish for your bright future.
All The Best!!