I have been told to do practice problems all the time. I do think that is a necessary part of the preparation. One thing my dad was emphasizing is knowing the theory cold. On the LSAT, it seems like they are testing the theory of argumentation. A quick read that put some things into perspective include A Rulebook for Arguments (https://www.amazon.com/Rulebook-Arguments-Hackett-Student-Handbooks/dp/0872209547/ref=sr_1_1?ie=UTF8&qid=1508938969&sr=8-1&keywords=rulebook+for+arguments).

Maybe that might help your logical reasoning. That seems to be where you could improve. I guess my rationale is that they can pull any type of question on subject matter. However, if you know the theory cold, you might become better at applying it in novel situations. I hope this helps.