They are a one shot deal to take them but you can review them over and over. I just bought one for Abnormal Psychology and found them to be an invaluable study tool for their tests. I would highly advise anyone too use them if they are available for their tests. Not every ECE has them though.

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Dawn
Taking the Road Less Traveled
The Journey of A Thousand Miles Starts with The First CLEP
BS-Psychology - Excelsior College
Enrolled in the School of Business, BS in Accounting
After MIS I'll be halfway there!
72 CLEP Credits, 21 DSST Credits, 25 ECE Credits (Including Inf Lit), 6 TESC Credits, 2 FEMA Credits = 126 Total
Withholding 6 Credits for Accounting = 120 for Psychology
12 credits completed toward my accounting degree