I wouldn't pay money for a course, I'd get a book(s) at the library first and see how memory works and learn some of the tricks and see what is possible. Anyone wanting money for anything has a "conflict of interest" where you are concerned; they want your money. Professionals like doctors, therapist, lawyers, etc. may also want to get to know you personally and help you, but people you are not interacting with one-on-one can't really have that goal. Look at how people spend money you pay them. If there are elaborate Websites and advertising; big "pretty" churches full of people being televised; that sort of thing, for me, means they're more interested in my money than in me, personally and everything they say has to be fine-tooth-combed for the "truth".

There are a lot of good, free sites from many schools about study skills such as http://www.ucc.vt.edu/stdysk/stdyhlp.html including facts and tips about memory: http://www.ucc.vt.edu/stdysk/remember.html