In A Level, if you don't pick subjects you have a passion for you will hate it and your results will reflect it. I know a girl who got all 9s at GCSEs and then took Chem, Maths and FM and History (all subjects she disliked and just chose for their academic reputation) and she ended up getting B, C, U, E at A Level. She was really bright too!
Therefore, my advice would be to take the subjects you genuinley love if you want to achieve well (which if you are hoping to go to Cambridge, is necessary). Take English since you are considering it, drama since you love it and then choose a final subject that you like! If you like Maths then that is good but don't just do it for the sake of it, it's really hard.
Also there is no need to take 4 subjects! It doesn't help at all.