Bristol offer a 4 week residential course for the Navs. I found it very good and passed all 9 subjects first time. They don't teach Air Law, Human Performance or morse, but give you a book of sample questions for the first two and there is a computer programme for morse at the school. Don't know about PPSC, but found the teaching at Bristol very good. Call them on 0044 (0)1275 474701 or Email
[email protected]. Good luck