Advice on uni prep

Hey. I'm currently on a gap year working, and will be going to Nottingham to study physics. I haven't really done any maths since leaving school, so I'm a bit worried about it.

I was pretty decent at maths at school, got a solid A, but obviously I've forgotten a fair bit. For example, completely forgot chain/product rule. But after a quick look over the equations, I was doing pretty much every question fine, probably as well as when I did my exams.

The other thing is, I didn't do FM. Some people have said I will find it reallyyyy hard, others say it's all covered in the first few weeks. Of course not everyone has done it anyways, so it might just be a bit more learning rather than recapping to begin with, but not too bad.

So just wondering what I should do. I have a friends doing physics at Leicester, and tbf, she was no where near as good at maths as me. She's suggest that I have a go at FM1, just to become familiar with basic complex numbers, matrices, etc. Also plan on going over integration, differential and vectors from C3/4. Any thoughts on what I should be doing, or how hard I should expect it to be?