Good advice from little red train. The ATPLs are by no means rocket science but a grounding in GCSE maths and possibly A-Level Physics would stand you in good stead for the course ahead.
Calculators are allowed in the exam so your knowledge of Maths would just ensure that you can understand the concepts a little better in the classroom.
All the best
MG
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Don't land in a field or the sheep will eat the aircraft.