Another advocate for Bob Tait here. If you can afford it, and have the time I highly recommend heading to YRED and doing the courses. The PPL runs for 3 weeks, and is well presented. The online practice exams are more or less what you get in the actual CASA exam. I reckon 85% of the questions on the exam where just about the same as Bob Taits practice exams.
I have not done the CPL course, but I know a few people who have and when I did the PPL course there was was a CPL course running. The CPL course runs for longer, but you do each module and then school books you in to do the exam. By the time you finish, all the exams are done.
The best thing about the Bob Tait course, is you are surrounded by like minded people, so your coffee breaks and lunch breaks are usually dominated by talk about flying and the course. Plus you get to sit in the hangar and judge the ****ty landings done by people like me!!!