Done fewer 4-section prep tests. I kinda burned out on LR. I just find them so boring now, every argument is just a recycle of a previous one. I'd have done more single timed sections, and limited my full tests to 5-section timed tests 2-3 times a week.
Oh, and I'd also not focused on my test scores so much, and focused on improving individual sections. So instead of "cool, I got a 173", I'd think, great, I got -1 on RC and -3 on LR combined. Gotta work on that -4 LG.
I started to do this later on in my prep, I think it helped me to focus more on my individual strengths and weaknesses.
Also, I would never, ever take the test in China again.