Hey,
I think the previous posters have the right ideas. If I were you I would do OG problem sets, but make sure you spend exactly two minutes on each. Pick 10 or so questions, take out a stopwatch, and time yourself as you do them. If you think you're done before your set two minutes are up, go back over and double check it to make sure you're making the best decision. (Obviously this works the best on the quant section. On verbal we suggest 1.5 minutes for Sentence Correction, 2 for critical Reasoning, and 6 for a three-question Reading Comprehension block, 8 minutes for a four-question RC block.)
While on the test itself, you will not (and probably shouldn't) spend exactly two minutes on each question, it sounds like applying yourself to that rigor while you study would be good practice for you.
Also, you might find this article on pacing during the test helpful:
https://www.manhattangmat.com/strategy-s ... g-pace.cfmGood luck!
Best Wishes,
Caitlin Clay
Student Services
Manhattan GMAT