Low PT vs. Drill Scores Advice

So I currently am doing really good on the mini drill sets that I take when I am studying and just practicing problems, typically getting a 100% or 1 wrong. However when I go to take a PT I feel like all that progress just goes away because I will get like 5 wrong in a row, and for some reason just can not seem to sit there and focus when I see I have 20+ questions left versus maybe 10. Does anyone have advice on where I can improve for the September test, which is so soon and I am so worried?