HELP! My score is dropping!

I've been studying for the LSAT since July 2019. After taking a weekend long crash course, my timed score was 158. In the subsequent months, I've gone through the core curriculum, worked with a private tutor, and used the Khan Academy practice resources. My last practice tests have been 157, 156, 154, and now 150. This is going the opposite direction that I want to! I am scheduled to write the January exam, and my goal is to score 162-164. Any advice to stop this downward spiral?