should I take sociology??

I've decided to take English Literature & Language and French at A-Level and I'd like to take Sociology as well but I'm not sure.

Those are the only subjects I'm properly interested in, and if I didn't take Sociology it'd probably be Maths- while I don't completely hate Maths, I'm not sure if I'd enjoy it at A-Level? It also seems really difficult; although I'm in top set Maths I tend to struggle with the harder tasks, especially ones which used to be part of A-Level but have been moved down.

Surely it's better to take the 3 subjects I am the most comfortable with and get (hopefully!) high grades? I'd like to go to a Russell group university to study English Literature and then Creative Writing if possible; would my current choices negatively impact that?

Any help is greatly appreciated! (and sorry if I've missed out any relevant information, just tell me!)