I am a US citizen currently living abroad and have high hopes of returning to US to enroll in a top university (Harvard and Princeton are in my heart). I have given my Cambridge O Level and gotten 8 As (A* Maths and Sciences). Now I will be starting my A Levels and am giving Pure Maths, Chemisty and Physics certainly. But for my 4th, I can’t decide between Further Maths or Biology. I love Maths but I’m thinking Ivy League may like Bio more as it will increase my pool. So please give your recommendation.