I'm pretty sure that changing subjects next term is too late, and the school probably would not let you change the subject next term. If it isn't too late already, you should change subjects now if you really want to change the subject.
If you want to change a subject do it asap otherwise you will have too much work to catch up on. I changed from physics to bio last week im still catching up some work.
i'm in year 11 now and i changed a subject not to long ago they give you about 6 weeks to get settled in and yeah if you eant to change a subject do it as soon as possible otherwise you wont be able to catch up on school work