[bluebird]

I'm planning to take CLEP Micro in December or January. but I have no clue where to start or how much time it's gon take.. I really need your help.

If you have a basic knowledge about the subject, how long does it take to get a good(65~75) score?
For example, I've read Principles of Microeconomics(by Mankiw) once kind of throughly. Roughly how much time do you guys think I need if i study 4~5h per day? a month? a week?

and roughly how many questions do you have to get to get 75?