Starting AS and want to know how mocks are done (doing chem,maths,bio,econ)
what you are tested on, when and how is entirely up to your school
obviously it depends on what they have taught you and that will depend on how they have decided to structure the teaching. In maths you will have completed C1 by december so thats an obvious possibility.
I'm half way through module 2 for chemistry should I start revising another subject after I finished it or should I carry on with chemistry? If so, which should I start next? I'm doing chem, bio, economics and maths