Maths for the ppl is minimal. Sub GCSE level. Toughest thing you will face is learning how to use the flight computer, and this does most of the work for you. I really wouldn't worry about it. At the end of the day you have to pass the exams to get the ppl so I would just crack on and see how you do. Any major issues, your instructor should be the first port of call.
All the best.