Although you may not have the time or ability to solve every quant problem on the GRE, a solid GRE timing strategy is to answer every quant question as you encounter it. If you leave several questions blank because you’re unsure of their answers, and then you run out of time, there is no chance that you will get any of those questions correct. If, instead, you guess an answer for each question you’re unsure of, and then mark the question for later review, even if you run out of time, there is still a chance you guessed correctly. Remember, there is no penalty for an incorrect answer. If you do have time remaining after you’ve gone through all of the questions in a section, you can bring up the status screen and revisit the questions that you flagged during the first run-through. Another benefit to this strategy is that you will be familiar with all of the questions that you guessed at, and thus you will better be able to decide which ones are worth spending your remaining time trying to solve.

If you find that there are two minutes left on the clock and you’ve only seen 15 out of the 20 questions in a Quant section, it is still better to fill in answers to all remaining five questions before those two minutes are up, rather than leaving any questions blank. That may mean taking a few seconds to eyeball each question and quickly guess an answer, and then returning to the question you are most likely to correctly solve in the remaining 1:30.

In the best scenario, you’ll have carefully paced yourself through each section so that you have sufficient time to work systematically on the final questions presented to you. But if that is not the case, you should do whatever you need to in order to ensure that you answer all of the questions, even if you only have a few seconds to select a random answer. Do not leave any question blank in any section, or your score will be harshly penalized.