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I was worried about this too. Start Integrated at Cabair this week. OAT do refresher courses, think they are around the £200 mark. I would advise doing what I have done. Get hold of some examples from the flying schools and ask questions on pprune. My Maths is poor, but I have not had too many problems with these papers. They cover basic Trig, Algebra etc....seems like you put the time in yu get the rewards. Anyway, I will keep you updated on how I find the first few weeks and rty and pass on some useful info.
might improve my typing also, sorry!