Sounds like you aren't familiar with the basic logical rules and deductions used in those types of games. First key is to learn those rules...and apply them deliberately (at a pace you can handle).
That is the first step. Turn the clock off (it appears you don't know how to solve those types of problems at the moment) and learn how to solve those problems successfully. Take 4 to 5 old lsats and learn how to solve the games section.
Next, take 2-3 sections and put yourself on a timer. Give yourself 30 minutes, then 25 minutes, 20 minutes...and then 17.5 minutes. Work on that time scale until you can successfully complete 2 games with one or no errors. At least by then you will be able to score 12-15 out of 24 (guessing included). That should get your score into the 150's by itself.
After that, make 11.5 minutes per game your next target. Depending on your LSAT write date, that might be the most optimistic timeline you can hope for. Despite what most people on this board can do...most people cannot solve 4 games in 35 minutes. Generally those people (at least from my experience) who are able to nail 4 games...were able to answer 2 games successfully their first try (at a minimum).