CLEP Natural Science (duplication?)

I had thoughts of giving the CLEP Natural Sciences a try to fulfill my Science electives- I have 2 but need one more...

The thing is I already have Intro to Bio and Intro to Chem under my belt fron traditional courses and theyre 3 credits each. I need 9 total.

As for the DANTES I'm having difficulty finding a testing appointment and the one lady that sometimes does testing around here I cant get a hold of...

I thought of General Biology, (that would duplicate my original biology but this test is worth 6 CREDITS not 3. Only thing this has a VERY low pass rate and I heard some awful things about it...

CLEP NATURAL SCIENCES has a higher pass rate (56% I think). Only problem is what sciences would it duplicate. I saw a chart for one school that said it duplicates bio but not Chem. Being worth 6 credts that would be fine for me if it only duplicates ONE!!!

The test supposedly is 50% BIO and only 10% Chemical Elements... I wonder how most schools would view the duplication...Like the big 3 for example...?