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So I've been studying since around August for this test and have gone through preptests 17-35 at this point. I've only done 3 TIMED PT's and the rest have been untimed work. My main worry is that I don't want to run out of practice tests for June, so would it be best to restart at 17 and only do my work timed from now on? (Timed sections during the week and a full practice test on the weekend). How have people that have redone preptests think of this? Thanks!

go thru the full 60, then repeat. you will remember less questions specifically this way. I am also well aware this is overkill, but it worked for me.