I wouldn't recommend 3/4 prep tests either. Nicole is totally right. You won't have enough time to properly BR and then brush up on your fundamentals between your PTs.
@c.janson35 hit the nail on the head. The flaw is that the political commentator's claims are false because people BELIEVE them to be false, which can not be properly concluded. Widespread opinion does not equate to the truth.
Read the passage again. While doing so, try to note why the questions that you circled gave you a hard time and how you could have approached the passage better so that, in the future, these gaps in your understanding can be properly filled in.
Just be properly prepared so that after the LSAT you can finish studying as much as need be for finals. If your load is light it really can't be that bad. Just do all your work all semester and do your LSAT prep at a decent pace and you'll be fine.