You can only be asked to prove theorems 11-13. You should know all the theorems as questions may come up where you are required to use any theorem to solve a problem

I think its you can only be asked to formally prove theorems 11, 12 and 13 ( like proof, given, construction and all that ) but the JC ones can come up in a question and you have to be able to identify it and work with it in a question

last years mock had one was to Prove that the angle at the centre of a circle standing on a given arc is twice the angle at any
point of the circle standing on the same arc.

JackW— 18/05/16