Ground school for pilots is good, although i found the nav a bit hard going. Radio nav is excellent.
If you want to know what JAR want you to know check this out <a href="http://www.srg.caa.co.uk/pld/fcl/fcl_information.asp" target="_blank">http://www.srg.caa.co.uk/pld/fcl/fcl_information.asp</a>
This will melt your brain, but dont worry...the course aint as bad as that. I am joe average when it comes to academia. No a levels, average GCSE's and no degree. My maths is hopeless, but i am passing the things. Any one can do it if you give it the time...I would recommend a full time course if there is any way, shape or form of you getting the cash together or reorganising your life - do it.