Im going to YR9 and found out for science that i was in set C.

Ask your teacher if they can set you some targets to allow you to move up. Also ask them if they can give you some extension work or some suggestions for how to improve your grade. Tell your teacher that you’re finding the work too easy, but you’re struggling with the test and see if they have any tips for how to better apply your knowledge in exam questions. Hope that helps and best of luck with year 9!