HT/HTL exam info

I would like to ask any information here in Dallas, Texas where i can find a review center for HT/HTL exam. And could you possibly give me a detailed book reviewer for this exam. somebody mentioned Carson book, Sheenan and bancroft/gamble book. Which edition and where can we find it? Can we find it in any barnes and noble store or you have to order it from ASCP ? I wish you could help me with this, I want to prepare myself for this exam.