I did bad at GCSES (7-4 with majority 6s) and want to apply to Cambridge maths. I am currently predicted A*A*A and want to get that to A*A*A* in September. I have done a wide range of super curricular activities. I know the best thing for my application would be to do well on the entrance exam but you sit the STEP after they decide who get an offer? So what can I do to shoe that im good at maths before they select who gets an interview.