ABX, I did my ppl about four years ago. Buy the BAK book and study it, do the homework questions and just sit the exam, there is no need, as far as I am concerned, to pay anyone to "Teach" the BAK provided you passed high school physics. I guess if you majored in arts and don't know PV=nRT or are unfamiliar with magnetic variation, deviation, gyros etc. it could be a different matter.
Come to think of it I sat my PPL exam without any coaching and passed that, as my miserable knowledge of regulations continues to demonstrate.
P.S. Treasure your copy of Stick and Rudder, its still in print, for the very good reason that the contents are solid gold. I read mine over again at least once a year. There is stuff in there that you won't find anywere else.