Hi there,
I've just finished all 9 exams (EASA). For textbook material, I used the full set of Pratt books which give a fairly decent understanding of the subject. However, to practise questions, I don't believe there is much better than this app:
https://play.google.com/store/apps/d...m.easapplexams
Also available on the iTunes Store, it is updated regularly and I personally found that many of the questions were more or less word to word identical. A perfect crammer and well worth the money in my opinion!
Hope this helps
Regards
Alex