I wrote my cpl exams in Feb this year. What worked for me was going through all the subjects at least 4 times and doing as many questions as possible. I studied on average 10-13 hours a day for 1 and a half months, and did nothing else. Treat your cpl like a matric exam and put maximum effort. I advise writing all in one week, if you can manage it. It also allows get them over with quickly, you'll have knowledge from all subjects at your disposal and you'll feel great when you pass all at the end of the week! As for questions I found the Central Flying Academy Q & A books very good. In all combined with Aeronav I did around 5000 questions before writing. There is also a C.D floating around that has notes and questions from the old FTC from grand central that is excellent. Do your ATP as soon as you get your comm lic. I know everyone is eager to go into flying immediately, but take the time and get the frozen ATP. Everyone tells me that it will stand you in good stead later on, also there is only about 30% more stuff than cpl so its best to do them when cpl knowledge is fresh. The subjects are valid for 5 years so you'll have plenty time to get 1500hrs. Hope this helps, now get back to work.