Alex,
No, I don't regard TT's books to be anything other that very good 'course books'.
Someone else referred to the 'confuser' type books, which are often used to pass the tests INSTEAD of aquiring the knowledge.
My point was a serious one- take your time and learn the stuff really well. Others often find themselves 'having to' pass the exams, in the sense that they're getting in the way of 'the real stuff'.
No dig intended.
CG