Time management is totally linked to how well you read and understand a problem. If you dont understand it, you are going to re read and re read... till you understand it. so, you waste time..
If you choose not to re read , you run the risk of interpreting the question wrong and solving a problem wrong. so, you do well on time, but screw up the question.
So, what is time management?
time management on the GMAT is to learn to choose when to hold on and when to let go. its as simple as this.
If you couldnt solve a problem in a 1000 yrs, spending 10 minutes on it is going to help. Narrow down your choices as much as you can , guess and move on. Learn to let go.
So, how you do train yourself for this?
1. Learn your concepts well. i cant emphasize this well enough. your time management is related to your command of the subject matter.
2. Practise tests. Thats one area where you can use these tests. I dont really have too much respect for their scoring models, but practise tests are great places to experiment with your strategy. you may agree that most of the time, we are going to have trouble with the tougher problems. the easy problems, most of us get them. First , train yourself to read a problem carefully. even if its the most simplest of problems, tell yourself that you are going to read carefully. Try to understand the problem as you read. Once you think you have tried your best, pick your best choice and move on. Do this is in a series of practice tests. See how you do.
Make sure, after every practise test, you study every problem carefully. in other words, always look to learn.
There is no specific strategy you will be able to implement unless you train for it.
Hope this helps