Chitty's Leader
I had a somewhat different approach with my FAA PPL,IR,Comm, CFIMEII and ATP. I used only the Gleim CD disks to study for the written as just that, a written. I then went into all the books afterwards to study and understand for the oral exam. This way I got the written out of the way quickly and with no chance of failure and had more time to dedicate to learning and understanding what I needed to know for the appropriate rating.
It worked for me