I guess if you're wanting to do Accounting or Economics, History would be the best option, as it relates more and will form a pretty strong Economics applicant, alongside Maths and Economics.However, if you prefer Biology and feel you could do better at it, by all means do it, I'd just do whatever you're able to get the best grades in. You could always do all four, that's what I've decided to do as I don't want to drop any of my subjects, the workload will be greater though.