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I've been doing TM homework, which is basically LR separated by Q-type. In those, I get about 80% accuracy, 80/100, having a lot of difficulty with the really hard questions at the end.

What's the best way to improve my accuracy? Is it more drilling? Reviewing? I'm shooting for 170+.

Review the ones you miss. Write down those that you struggle to understand even after reviewing and have the instructor go over them in the thirty minutes before class. If you are at least trying every question you are already way ahead of the game. That is a ton of homework, but the homework, supplemental sections and diagnostics constitute every released question since 1991.