There are a few simple strategies that I’ve found helped to get a better score on GMAT. I hope these can be useful to you as well.
The first few questions hold more weight than the final ones. The GMAT is an adaptive test, so it tries to determine your aptitude by asking harder questions the more you get right and easier questions the more you get wrong. By the time you’re on the later half of the questions its already got a pseudo idea of where you stand and is trying to narrow it down. So if you do really poorly on the first half of the test its even harder to climb back up even if you do super well on the later portion. By devoting more attention and even more time on the first half you can help propel you into a higher category than otherwise
Don’t run out of time. I made this mistake my first time taking the test and I firmly believe I would have gotten my ideal score had I rushed through at the end instead of trying to get every question right. You are penalized for not finishing your section, so even if you guess, you have the opportunity to get a higher score, because of the idea I previously stated, than if you have questions that you never get to
Write/Visualize everything out. The questions on the GMAT is designed to trick you, because they not only want to test your true math skills but your critical and logical thinking as well. While this can be frustrating it also gives you the opportunity to trick the GMAT as well. By writing and visualizing what you can, you can uncover patterns or cross off certain answers that help you determine the true answer. You don’t always have to know the right answer if you know all the wrong ones and this can help shave time on tough questions that are designed to stump you.
For native english speakers, you have a natural advantage on the english section. Foreign students tend to do way better on the quantitative section, making it really hard to achieve a strong percentile while they can’t compare to the grammatical section. For example, on the quantitative section I scored at a 50%, while on the english section I scored about a 95%, even though I scored two points higher on the quantitative section, leaving me with a 90% overall. If you have to choose, really hone your skills on the english side to give you a strong boost for the final score.
I hope these few tips help you out and please let me know if you need me to clarify or explain further. Good luck