Hyper,
If you have plenty of time to spare on the quant, then your approach might not be at its best.
Although 600 is not a bad score, you really should have little to no time left when finishing the quant section. For the quant, the first 10 questions should take you about 25 mins. Since these first 10 are critical in the path your test will take - and your score - take the 5 extra minutes here to make sure you give these your best.
You should get to your last 10 questions with about 12 minutes or so to spare. Don't get worried. If you've taken your time on the previous 27 or so problems, you should be doing fine at this point. It's up to you how best to budget these last 12 minutes for the remaining 10 questions. You may end up taking 2 minutes each for the first 6 questions and just guessing on the last 4. This is actually not that bad of a strategy, since the last 4 questions are not as critical to your score as those first 10.
The verbal is a different story. You may do well and still end up with plenty of time left to spare on the verbal during your first few practice tests. So, in the future, be sure to use as much of that time as is productive. Take your time on sentence correction and RC problems to ensure that you are certain of your answer. With this section, you probably won't be rushed for time, so take proper care in answering each question to the best of your ability.
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