Further Maths. Should I drop it?

Hi everyone,

In year 13 and I am currently taking Maths, Further Maths, Economics and Physics. I want to study Economics at uni. I have applied to (BSc where possible) Uni of Sheffeild, Uni of Bristol, Uni of Edinburgh, Durham Uni and Uni of Cambridge. I am predicted 4 A*s, so this may seem like a weird question, should I drop Further Maths? More context: Maths teacher says that it is possible for me to get an A* but he thinks its more realistic with me to get a B. With Cambridge often requiring an A at least in FM (the rest of the unis not requiring it (and I don't mind going to any of them)), would it be a good idea to drop it now so i can, kind of, confirm the other 3 A* or is that a bad idea? How useful is FM for economics at uni? And if dropping won't affect uni will it affect anything else?