You might benefit from looking back at your PT score graph and identifying the root causes of your bad scores. When you got the first one, were you particularly stressed, tired, or anxious that day? it's possible that getting one bad score is allowing you to get in your head and feel defeated, which is affecting your practice going forward and lowering your scores generally. It might help to practice moving slowly, saying some affirmations before you test, and assuring yourself that you likely didn't forget the logic—you're getting in your own head.