... and foolproof. So maybe take 36, but just know good and ... you're PTing, start at 36 and work your way up ... from there. (We start at 36 because the curriculum draws from ... and below. That means that 36 is the first PT in ...
Yes, the earlier tests are great for drilling/learning on. This way you will have plenty of tests to take as full-timed PTs when you are ready. Generally people use PTs 1-35 for drilling and then 36-80 for full-timed exams.