Read the actual question -> read the answers -> skim stem and pick out info to help you delineate which answer is most correct.
Starting from the top and reading the entire stem of every question is going to slow you down significantly. There will be questions where almost the entire stem is irrelevant to what they are actually asking.
This is so key. Additionally, I think it's helpful to stratify each question into 5 buckets after you read the question/answers:
1) I absolutely know this cold
2) I don't know this for sure, but I think it is most likely xyz and I can come back and maybe reason my way all the way through this
3) I don't know this for sure, but I think it is most likely xyz, however no amount of reasoning is going to help me further figure out the answer
4) I really don't know this, but I can eliminate a few choices I know are wrong. If I come back to this I might be able to further narrow down my choices.
5) I really don't know this, but I can eliminate a few choices I know are wrong. No amount of reasoning is going to help me narrow this down any further.
If you can recognize these patterns, then buckets 1, 3, and 5 should be done in 45-60 seconds tops. If you're being honest with yourself and your knowledge base is sufficient, then buckets 1, 3, and 5 should also be the majority of questions. I think 25-33% of questions really falls into buckets 2 and 4, so if you’re speeding up on the other 3 categories that saves you some extra time for the questions where actually thinking through things will help.
Importantly, I would still mark down whatever your initial impression is within 45-60 seconds, and then flag questions in buckets 2 and 4 to come back to. This ensures that you will at least see every question in a block, and then you can spend whatever time you have left over to come back to the questions where you think you can reason things out a little more. This feels uncomfortable, but it is by far much more important to make sure you get to see every question in a block than it is to get a specific question right if it takes you 5 minutes to reason your way through it.
If you have a lot of questions in buckets 2 and 4, then that is a fund of knowledge problem.