Free Clep Prep Practice tests - Good score to know you're ready?

[gremlinbrawler]

Hi guys,
I'm trying to find out what a good score is on the practice tests on freeclepprep.com to know that you're ready for the real thing.
The site is a bit confusing on their FAQ answer for this question.

I mostly study with instantcert so I would like to just go take that test once to know if I'm ready. It seems like it's more designed to use the test as a study material though so they say to keep taking it until you get 90%. I don't really feel comfortable with that though because of course if you keep taking the same test you will get better and better and that just means you know the specific questions on that test, not necessarily a well rounded understanding of the subject. Especially considering the questions will be different on the real thing. That doesn't mean that I won't utilize the test after I take it for more study but I would definitely like to know if my first result is adequate.

Anyway, this is for the Environment and Humanity DSST. I usually use the official clep study guide book for my clep practice tests and if I get around 60% I feel comfortable to go for the real thing and have always passed with that so far.

Does anyone have experience with the freeclepprep.com tests? Would you say a similar score of 60% would likely be accurate?

Any feedback would help
Thanks everyone!!