If you are forced to speed up, do it efficiently. Usually one or more answer choices can be eliminated without too much difficulty. Above all, don’t panic. Don’t speed up and just begin guessing at random choices. By pacing yourself, and continually monitoring your progress against the clock or your watch, you will always know exactly how far ahead or behind you are with your available time. If you find that you are a few minutes behind on a module, don’t skip questions without spending any time on it, just to catch back up. Spend perhaps a little less than half a minute per question and after a few questions, you will have caught back up more gradually. Once you catch back up, you can continue working each problem at your normal pace. If you have time at the end, go back then and finish the questions that you left behind.
Furthermore, don’t dwell on the problems that you were rushed on. If a problem was taking up too much time and you made a hurried guess, it must have been difficult. The difficult questions are the ones you are most likely to miss anyway, so it isn’t a big loss. If you have time left over, as you review the skipped questions, start at the earliest skipped question, spend at most another half a minute, and then move on to the next skipped question.
Lastly, sometimes it is beneficial to slow down if you are constantly getting ahead of time. You are always more likely to catch a careless mistake by working more slowly than quickly, and among very high-scoring test takers (those who are likely to have lots of time left over), careless errors affect the score more than mastery of material.
Scanning
For Reading passages, don’t waste time reading, enjoying, and completely understanding the passage. Simply scan the passage to get a rough idea of what it is about. You will return to the passage for each question, so there is no need to memorize it. Only spend as much time scanning as is necessary to get a vague impression of its overall subject content.