I'm not sure about universities in other countries, but where I live in Europe, you don't need any A levels or GCSE or whatever, you just need to have passed high school, even if that was with a bare pass 50%. Even for a Masters in Medicine you just need a Bachelor of Science. After Masters, you specialize as a doctor.
I see English students strive for their 'A-levels' just to get into a university and it surprises me. I graduated as a Bachelor and I never needed any 'A-levels', good grades, admission tests or anything of that kind.
Could someone provide some background information please?