[grad-one-day]

I am looking at Instantcert to study for the D&A Abuse. Is Instantcert better than the REA's clep books for clep test? I was not impressed with the clep books and the test I took asked very little questions on the material I studied. I have just heard about Instantcert and am curious whether or not it is worth the $20 a month to purchase. Is Instancert all you need to pass the test? Any advice? Thanks