I don't know about these tests specifically but while they might be on similar material AP tests are generally WAY more in depth and more difficult than DSST or CLEP. If you are looking for study material anything for the AP would help you but I highly doubt the actual test is the same.

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Goal: Excelsior BSGB 61 of 121 credits earned to date
I'm halfway there! (Whoa oh, living on a prayer)
21 transfered credits
6 more from AP English (4)
EC: Info Lit (P in 2 hours)
Clep: Educational Psych (69) Management (70) American Gov (53) A&I Lit (74) Algebra (52) Marketing (72)
DSST: Intro Comp (68) MIS (67) Here's Health (66) Supervision (60)