Entry Requirements

I'm predicted 6A*s in A Levels. I'm class representative, president of student council, and on track to graduate as valedictorian. I do debate and model united nations as my extracurriculars and have won a few competitions, and during the holidays I volunteer at a legal clinic. However I failed IGCSE maths. Would this affect my university applications? I'm currently looking at majoring in Philosophy, Politics and Law at King's College London.