Regarding new exams and lack of feedback:
The CAA inform me that I'm the first person in the UK to write the non-transitional ATPL(H) exams. I've only written 4 of them so far, and I don't have the results just yet (this week, one hopes!), but I can definately say that I wasn't uncomfortable writing them, as my school made every effort to teach me the necessary stuff. The question banks have most of the questions (although there were a few new ones), but the syllabus I studied from covered everything. If the syllabus is known (as the ATPL(H) one is), then lack of feedback makes no difference at all; you still have the option of protesting a question if you feel it's unfair!
My suggestion would be to choose a school that teaches you the material, not one that helps you memorise questions.