When you say timing strategy I think that we need to really take the strategy part seriously and not only think about answering this many questions in this period of time. Here are some thoughts on timing on the Quantitative side of the GMAT.
Many people base their "strategies" on the fear of missing questions. This leads them to the following approach - when they encounter a strange and difficult problem they become focused and alert and put maximum time and attention into this problem. Then when they see a problem that they can get right they try to not only get it right but do so in the shortest possible time so that they can make up the time they just devoted to the really difficult problem.
The better way to approach the quant section is this:
When you see a question that you can get right - devote the attention and the time that it takes to get it right. There is a difference between struggling for 3 minutes to come up with a strategy for a question you find very difficult (this is usually a mistake) and spending three minutes doing what it takes to ensure that you get a particular question (that you know you can solve) correct. It is a matter of approach to the test and it can make a huge difference. Do not try to steal 20 seconds from questions that you can get right only to hand that time over to a question that you will likely miss anyway.
Here are two things to think about:
1) If you do not have a specific strategy for solving a quant problem in about 1 minute and 15 seconds then you will want to choose from the viable answer choices and move on. It is precisely this type of question - where you have no strategy for a long time - that can sap the time and energy right out of your quant section on the test.
2) Set a time standard for yourself - I like to say that after question 25 I should have 25 minutes left (for the last 12 questions). If I am 5 minutes behind, I will just skip (randomly guess) at the next two problem solving questions I see. This will bring me back to the right pace. This is a better strategy than the alternative of " I can catch back up." Be careful here, trying to catch up usually means saving 20 or 30 seconds per question and we already know this is a mistake. Better to sacrifice two or three questions for the good of the test.
Finally, focus on getting questions right rather than on fearing that you might get some wrong. You will get questions wrong. But if you get say, 25-30 right out of the 37 you will score very well on the Quantitative section.
