Very frustrated: I've been having blind review scores in the mid-170s and actual scores in the mid-150s forever, and I don't know what to do.

My stats?

  1. On average, I leave 4 to 6 LR questions blank, and 10 RC questions blank. I just can’t get through them.
  2. If I can simply fill in the remaining questions I wasn't able to do on time, I’ll be hitting 169 or 170.
  3. I had a low 160s score once (only once), and that’s also the time I answered the most questions (probably left 3-4 LR questions blank, and 6 RC questions blank.
  4. Almost all of my blind reviews are in the mid-170s.

What have I tried to fix my problem?

  1. Prephrase: it helps a bit with my accuracy, but I'm still slow.
  2. Slow down to speed up: Yes. I don't even know if this tip works for me. I often spend 5 to 6 minutes on an RC passage, which is too slow.
  3. Sort answer choices before thinking carefully: yes I did.
  4. Study more: I've been studying for more than 6 months already. I review questions extensively after I practice. Not only did I review flagged questions + questions I got wrong, but I also reviewed questions I got right. I always try to make sure I know exactly why each answer choice is right and each answer choice is wrong. As I’m not a native speaker, I also spend some time looking up the words I don't know when I review. (I'm not talking about blind-review here. These are all the things I do after blind reviewing.)

What do I think might be my problem?

I really don't know… 1. maybe I re-read too much… 2. I'm not a native speaker. Maybe my vocabulary bank is a lot smaller than everyone… I don't know if that matters…

Can someone please tell me what to do? I'm happy to answer more questions if that helps (I’ll keep adding things here based on some questions in the comments).