I recently just got my GCSE results and they have been very good ( 9in maths , triple science, geography,German, both englishes, 8 in computer science) and my plan has always been to study maths at a good university. My sixth form encourages people to do 3 a levels but considering most applicants to Cambridge and imperial do four and the fact that maths, FM and physics overlap a lot , is it potentially advantageous to do 4 a levels which my sixth form allows but discourages