--Biology Exam On Friday, Should I get Peterson Or IC to practice tonight

[Saturn]

I have been procrastinating all Summer to take the Biology CLEP, and its going to be my first CLEP. Today it is finally hitting me that day after tomorrow I have to give the Exam.
Would you suggest getting the Peterson 's practice Tests or IC's.Both cost the same I think.
One other thing should I study more and then try them or study from them....or worst case scenario is change the test date.

I haven't been focusing on studying and have no bioology background.
I have been studying from Cliff Study Solver, online a bit and some other websites that were mentioned here?

Excuse me....I see that a lot of people are talking about IC's but I still don't know what the abbreviation stands for...