Yes they are out there....but I couldn't recommend a particular one. The challenge is like other "coaching" areas, there are a high % of hacks and only a handful of really good ones. It would be highly unusual that the good ones are also inexpensive, so it would also be an additional investment, which may or may not provide a good return on investment.
Have you tried one of the online psych study companies? I did PsychPrep (I'm sure others are probably comparable), and they offer an online person who reviews your scores and can provide feedback about how to improve. I never utilized this option because I just wanted access to the practice exams, but I think the feedback option would have been helpful. Almost every testing company also offers in-person training weekends and similar, so maybe that may help.