Have you tried coffee? 5 Hour Energy? What time are you taking your PTs? It's important that you do it at the same time as you'll be doing the actual LSAT. Are you exercising? Eating right? Are you waking up at the same time each morning? Making sure you answer 'yes' to all of these questions will solve the problem.

For reading comp, force yourself to interact with the passage. Try to trick your brain into thinking it's the most exciting thing ever and you can't wait to read more about it. Ask questions, make predictions as to what's next, make mental pictures of the passages in your mind. Do the same for LR. Yes, test-day adrenaline could snap you out of this, but it's best not to rely on it. What you're doing now isn't working, so you need to start making changes to the way you're studying and the way you're living.