No improvement?

I just scored a 163 on PT139.

Just for some background, I decided to study for the LSAT about a month ago and I have just one chance to take it in January if I want to begin in the fall. I work full time and study when I can, but my job can be very demanding at times. I've taken a practice test every weekend for the past 4 weeks and have scored 164 3 times in a row, and a 163 just yesterday. My blind review is consistently high and I found it's because most of the questions I get wrong are the ones where I'm left between two options.

How can I improve to at least 170 before January 5th? The recorded lessons are great and all, but I've been having some difficulty learning the "lawgic" so I've just been doing all the questions in my head. Is there a better way to study? I feel like the tutoring sessions helped just a bit, but I'm not seeing any improvement.

Any advice would be greatly appreciated!