I'll chime in with the structured process I used. All of the following assumes you've been through fundamental lessons/the 7sage curriculum. If you haven't learned those basics yet, start there.

Then, begin with untimed drills. I did 10 LR questions or 1 RC passage at a time, then blind reviewed it all. For every question you got wrong or weren't 100% confident with, watch the explanation video. Do this until you're able to regularly get -0 or -1 on those untimed drills.

Then, introduce some timing. I started with target time + 3 mins, but feel free to start as high as target + 5 mins. Once you're consistently getting -0 or -1 with target + X mins, drop it down by 1 minute and repeat the process until you're drilling at target time.

If you're consistently doing these drills with -0 or -1 at target time, you'll certainly be able to hit 165+ on a full test. 170+ would be very attainable as well.

I firmly believe that 165+ (and 170+) is achievable for everyone, but it's a (long) process. It'll take many months of consistent practice to get there, but you'll definitely get there. Good luck!

For drills, I do 1 passage at a time. Start completely untimed, giving yourself as long as you need to finish the passage and be fairly confident with most/all of your answers. After you can usually go -0 or -1 on the passage, start to introduce timing. My method was to give myself target time + 3 minutes for a passage, working my way down to drilling at target time (while still reliably going -0 or -1). After that point, you should be able to get a full timed section done without feeling super rushed.

For all drilling, you want to sit in the sweet spot where you're not overly rushed and taking mental shortcuts to save time, but you also have enough of a time crunch to feel a bit of pressure to not waste it either.

Hope this helps!