I got the Performance correspondance course from Bristol last year. £85 , very good feedback questions and a very good pass mark. I spent about two weeks playing with the course then sat the exam.
I asked about a crammer and they said they did not do one any more (lack of demand I guess) You must be one of the last to need it. I thought I better get it out of the way before the CAA stop allowing you to do it.
Oh , forgot to say, I thought the content of it was actually interesting and amazingly for a CAA eaxm was actually relevant to flying aeroplanes (unlike Schuler tuning).