Each person is different. I was able to do one test every 7-10 days, which I thought was quick until I saw others were doing the same thing with three days of study. Once you take several tests, you'll get a better feel for how much prep time you need. Good luck!

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Associates Degree, Aviation Maintenance Technology, Community College of the Air Force
Bachelors of Science, Liberal Studies Degree, Excelsior
MBA Human Resource Management, California Coast University