Hmm - I've found that some alleged RAF-trained pilots have difficulty with even the PPL exams.....
As well as mathematics, you will also need some elementary physics. For example, do you understand the difference between density and specific gravity? Or Newton's Laws? Or the concept of vectors?
The number of thick, dimwitted students filtering through the system who thought that mathematics was something which "did their head in" was depressingly high, I found towards the end of my Service career.