Just to clarify... The EC exam is Ethics: Theory and Practice, a 3 credit upper level exam, and the DSST exam is Ethics in America a 3 credit lower level exam.
I got an A on the DSST version, and a B on the EC test. Do opt for the practice exams from Excelsior for their test. Many of the scenarios were the same. It helped being familiar with that info.

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Bachelor of Science - Excelsior College
Liberal Studies
Areas of Focus: Administrative/Management & Health Professions