Further Maths as a 3rd Alevel

I'm thinking of doing Economics at university (somewhere like bristol, UCL, bath) not LSE or oxbridge. Right now I'm doing Maths, FM, History and Politics. However I got my timetable today and I have barely any private study periods compared to everyone else as they all take 3 subjects. I just think it's unrealistic to take 4 alevels when I only need 3 and then have way less time to have to revise for all 4 of them. So I'm going to leave it for a few weeks until around half term and decide which one to drop. As of right now, I think I'd drop Politics and do an EPQ on economics instead however I'm scared because then I'm only doing Maths, FM, History (+EPQ) which is quite limiting if I change my mind in year 13.
But let's say I do still want to do Econ at uni, will Maths, FM & History + EPQ be a good application? thanks.