Kaplan's Five Basic Principles of Test Expertise
Keep Track of Time
Of course, the last thing you want to happen is to have time called on a particular section before you've gotten to half the questions. Therefore, it's essential that you pace yourself, keeping in mind the general guidelines for how long to spend on any individual question. Have a sense of how long you have to do each question so you know when you're exceeding the limit and should start to move faster.
So, when working on a section, always remember to keep track of time. Don't spend a wildly disproportionate amount of time on any one question or group of questions. Also, give yourself 30 seconds or so at the end of each section to fill in answers for any questions you haven't gotten to.