I have a very able year 8 pupil, who will be doing his GCSE Maths from next year. I could actually enter him now and with a bit of extra help should be able to get an A*. I don't want to do that because we will run out of things for him to do in the next couple of years and we already have some cases like that. So I started giving him some lessons in C1 and so far he has handled it better than most of my A Level Maths students. Now is my questions, 1. I could actually enter him for C1 next January (May is a little bit too soon because I only have him 1 hour per week for C1). Can he do C1 before he even takes the first module of GCSE? 2. This question might not be relevant for now. If he does not get a good grade for C1 ( I expect >90% or more) and he retakes it. I read somewhere that certain universities do not favour students, who have to retake their A Level module. Is that true? Thank you in advance for any answers.