Stop churning and burning preptests. Focus on a section or even just a type of question or type of game and really lock it down. Forget about the clock for a while and work on getting a better understanding. See if you can get yourself to the point where you can get a 180 off the clock. Then speed back up.
Earlcat has a point. I did something similar to help increase my speed.Another option you have is as follows for the LR sections. I recommend doing the first 3-4 pages, then flipping to the back of the section and work backwards. There is evidence that the first 10 questions tend to be easier questions (although you may have a tougher question thrown in). Somewhere near the end you will find an easy question or two as I feel LSAC beleives many people won't get to them.Lastly, don't dwell on questions. If you hit a question you struggle on for a minute, skip it. Better to get points at the end and guess on the 1 rather than taking 3-4 minutes on 1 question and guessing on two at the end
Although this can be a risky strategy since it may get you going through questions TOO fast and lead to sloppy mistakes, when I was studying I gave myself 30 minutes for each section instead of 35. I did this because I knew I would lose time time during the real LSAT to anxiety or whatever else. In addition, because I used this strategy during the real LSAT I was confident I could get through every section with time to spare to review my answers. That said, most prep books do not recommend you study this way. In my personal opinion, it worked for me so if you think it could work for you go ahead and give it a shot, just be aware of the risks.