Thank god 1 time was enough for me. Would not want to try it twice.
The best thing I did was too take a course in Tom Henry's class, Some might agree, or disagree, but when it come to the Blocks and Assoc. test he knows what he was talking about. I dont work for him, nor did I get paid to say this, but it's true.
I remember one guy in the same time I took mine, and the only book he had was the Handbook (not allowed), and he had to take the test without a book of any kind. Could you imagine how he felt.... Out of about 15 people taking the test only two of us passed that day. Not very high statistics.
GOOD LUCK....