My 16 year old daughter passed the Calculus CLEP today. She used the following: Thinkwell Calculus from January - October (with time off in the summer) The College Board Calculus Guide The REA Calculus Book. She scored a 60 on the exam. Afterwards she said that she did run out of time for 3 of the problems; but overall, the REA Book was a GOOD resource for her to fine tune for the exam. Shawn