Had a Tristar down there once too but I digress....
The level of mathematics and science required for ATPL's is only GCSE level. Gen up on trigonometry, algebra (rearranging the formula to make 'x' the answer etc..), vectors, know what the cos/tan/sin buttons are for on your calculator, study tempreture/pressure/density relationship and perhaps learn some basic electrics theory. Do that and you should be well set.
G'luck!
VFE.