I would highly recommend using the Cambridge Packets to drill your weaknesses.
LR: For LR, this bundle breaks down PT 1-38's into the different Question Types
http://www.cambridgelsat.com/bundles/logical-reasoning-by-type/
LG: This bundle breaks…
Here's one little tip for the assumption questions. If there's a term(s) introduced in the conclusion and is nowhere mentioned in the premises, you can expect the correct answer to include that term because you are trying to bridge the gap.
If that's the case where you took the test from the computer, I would take the 131 with a grain of salt. There's simply a huge difference between reading the questions from a computer screen and actually having it on paper. Do a printed PT for a pro…
Yup. Questions start to get fairly difficult after the 13-15 range. And then the last few get a little bit easier.
A tactic that's thrown around is to finish the first 15 in 15. That will leave you 20 minutes for the last 10 or 11 questions.
@synergy_101 already listed some but if you want challenging LG's in general, do the ones from the early 1990's. For some reason, the logic or at least the wording appears a bit more complicated than the "modern" LG.
You can do it! Keep drilling LG over and over! Some PT's just have harder games than usual so don't let a few bad PT's be representative of the sample size!