Another thumbs up for Derek, though he's way down south so you'll need to go and stay for a few days.
I stayed a couple of days and did 3 exams, including Air Law which was driving me nuts. It's hard work and intense but well worth taking a few days out to concentrate on the theory side. The alternative is to try and fit studying around your normal busy daily life which works for some people. Depends on you, your cricumstances and many other things.
Derek is a lovely guy but laid back about things and frustratingly difficult to contact. Don't be put off though because he'll help you through the exams and you'll have a little working holiday with other propellerheads.
PM me if you want his contact details and I'll dig them out.