The ab-initio course at OATS consists of three components
1. Ground study & flying tuition with exams/flying tests for the purpose of licence issue.(CPL)
2. Flying training/tests in order to gain Multi Engine Class Rating & Instrument Rating.
3. MCC training.
Don't do a PPL course if you intend taking this training route.
Do buy the book, and have a few hours flying prior to spending a very substantial amount of dosh!
Best of luck.