Dropping maths in year 13

My current A levels are maths, economics and history. I am currently predicted AAC. This I believe to be quite accurate as from year 13 to date I have been achieving As in history and economics and Ds in maths, but Cs in year 12. As mocks are coming up in mid February, I believe I will probably end up with BBD in maths, economics and history, D in maths. However, I asked my school of also doing the politics mock. Meaning that if I get BBD or BBE or AAD or AAE, where maths is a D or E, but if politics is a C or a B, should I drop maths and take politics? As if I can get a B or C in the mock without doing much work, I can probably get at least a B in the A level. The reason why I consider doing this is because I read a lot of politics books for fun, meaning that the spec looks familiar.