Cqt
I passed the CQT exam last March. I had to learn a lot as someone new to the field, and used the Quality Council of Indiana Primer and CD. As references I took the primer, Juran, and The Certified Quality Technician Handbook (Benbow, Elshennawy, Walker). This book came with an additional CD that had some sample exam questions. I also happened to have a "Memory Jogger" given to me by my prevous employer ... "A Pocket Guide of Tools for Continuous Improvement and Effective Planning." That is something I already had and was helpful for quickly looking up some basic info about the various quality tools.
There are additional threads on the CQT exam if you go to page three of this forum.
Hope that helps, and good luck!