My understanding is all CLEP and DSST tests do NOT penalize you for a wrong answer. So guessing is always better than not guessing.

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CLEP's Taken
Spanish - 74 (12 credits)
English Composition W/Essay - 63 (6 Credits)
American Government - 51 (3 Credits)
Freshman College Composition with Essays -74?
U.S. History I - 54 (3 Credits)

DANTES Taken:
Heres To Your Health - 63 (3 Credits)
Intro. to Law Enforcement - 66 (3 Credits)
Criminal Justice - 60 (3 Credits)
Ethics In America - 48 (3 Credits)
Astronomy - 56 (3 Credits)