Hello Student

Generally there is no rules that can change the subject of 11 class  after examination in 10th class course. You have taken the subjects of PCB that means physics, chemistry, biology and mass media and English in your class 11 course. These subjects will have to continue in class 12 . If you change the subject which subject you have taken in class 11 whenever you will be promoted to class 12. There will be a problem you may face in the future course of study. There is no chance of changing the subjects of class 11 whenever you will get promotion to class 12.

Hope this helps.