I'd agree with what the others have said. Don't worry too much about it. There is a fair bit of maths/physics involved but nothing too troubling. Get hold of a GCSE maths book and have a flip through that if you like. Discard all the stats, quadratics etc. Be happy with basic trig, might also help to get an appreciation of relationships in equations.... ie, if one value goes down another goes up. Most of the maths involved is 'comon sense' maths..... basic arithmatic really. Everything will become clear as you work through the course.
I didn't go past GSCE Maths and find ATPL no real challenge as far as maths/physics is concerned. (ps, I went with BGS)