I think you need:
Standards Document 19, Version 2. Notes for the guidance of applicants taking the PPL Skill test (Aeroplanes)
As ever, Adobe's Acrobat Reader is required to read it. However, it's in LASORS (£5+P&P) so I'm not sure why your school charges you a tenner for it. I'd definitely recommend buying a copy, if only for the GA Safety Sense leaflets in it - look
here for more (and I'm not CAA
).
In general, a good place to start looking for answers to licencing questions is:
http://www.caa.co.uk/srg/licensing/fcl/document.asp