While attempting to get a Ham radio license, I went to a website that offered free practice exams.  The idea was to take the practice exams until I could repeatedly pass them.  So, over a weekend, I decided to immerse my self in learning the exams.

The first time I took the practice exam, I failed it miserable.  But, not to be discouraged by one test, I took it a few more time and could start to see an improvement.

Since it took about 10 minutes to take the test and review the answers, I could do about 6 test per hour.  And, depending on my activities, I could do 30 to 60 in a day.  After a few days, I was passing every practice exam, and was even managing to get perfect scores on occasion.