I was in the same boat. I decided to save preptest 40-80 for testing. Will do 5 from the 40s, 50s, 60s,70s,and 80s and save the other half in case I need to retake in December. I figure having 40 preptests will be more then enough.
... an 80-83. Any particular 70s or 80s?
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I recommend doing 1 80s PT test broken down into ... timed sections, and 1 full 80s as a full timed PT.