I have done 13 IGCSEs for 5 subjects and I will be moving to the UK for Sixth Form. I have seen some requireme?

..some requirements and schools ask for 6 subjects for grades A*-C. I think I will be achieving grades A* and A though so would they let me off for having done just 5 subjects? I will be moving to North London and I'm a citizen just for reference, in case that changes anything. I am planning to do Maths, Further Maths, Physics and/or Chemistry, and ICT for Sixth Form. The colleges/high schools that I have looked at are the ones in Harrow, as I will be moving to that area. Any suggestions for me? Thanks.