yes the bob tait exams give you a right wrong only but I actually find the format to be a good one.
The result you get looks identical to a CASA cyber exam and tells you what you got wrong and what topic it was, the idea being that if you got a question on that part of the syllabus wrong, you dont know it well enough and need to restudy that section.
Simply telling you the right answer, even with a brief explanation as to why will not teach you what you did wrong, just how to get that particular question right the next time. At least thats the way I see it.
As for the books I unfortunately got sucked in by the fact that the ATC books came in a complete package but am now wishing I got Bob Tait instead