It's not about the company, it's about the instructor. Find someone who has been in the game a long time. If the company won't reveal who your instructor will be, they're probably hiding something (like the fact that he's still in training).
Also, OP, don't use a TPR book if you're going to take Kaplan (and vice versa). Wait until you've settled on a company/tutor, and only use their materials. Mixing methods is a really really bad idea.