I've not done a full-time course but I would imagine there would be tutors there who could give one-to-one help in a specific aviation context if you're struggling with certain concepts.
However, try BBC Bitesize for algebra and basic maths (although you won't need quadratic equations) and try this for trigonometry
http://openlearn.open.ac.uk/mod/reso....php?id=210637
There's really nothing more advanced than this.
Cheers
Whirls