Dr. Collins is a person who created a PCAT study session in south Florida for people who wanted extra help and practice in preparing for the PCAT. For those who don't live in south Florida, he offers a self study package that includes the practice exams mainly and short review packets for math, chemistry, and biology. The self-study costs 325 dollars and the in class session costs 515 dollars. You can find more information at his website
here.
As to whether it helps or not, in my opinion, it's really up to debate...you can find many posts about what people think of it in the long Dr. Collin's thread
here. Personally I think the best way to prepare is by using the 3 exams provided on Pearson's website for 80 dollars, which you can find
here. The Pearson practice tests are definitely the closest thing out there to the real deal.