Hi , I just wanted to let you know my thoughts on what you've said, as i did my mine a year ago but its still all relevant. Those that have described it as the letters are exactly right. 3 tests, looking for a different pattern each time. You're so focused that its difficult to judge how you've done, as the tests are over so quickly, each being between 2-3 minutes only. One word of advice is that even though the tests follow on after each other, you can take a few minutes break between each one to gather your thoughts, as you have to click to begin the next one when you're ready.
What i also did was to record my test as i was doing it. As I reviewed them afterwards, i noticed on the last test that I had missed 3 letters. I still passed it, as its not as much a test of speed , as it is accuracy. The tests have so many lines that they are designed so that you can't finish them all so don't try to, as in rushing to complete as many lines as you can, you will miss far more than you should. Remember, its not speed but accuracy that they're after.