How To Increase Our IQ Score

1. The first way is to learn how to be a better test taker. Go through the test quickly, skipping over questions you aren't sure about. Then return to those later. It is better on a timed test to answer all the easy questions first. You wouldn't want to have no answer for several easy ones just because you spent too much time trying to get the answer to a tougher one.

On multiple choice tests you should always answer every question. If you are not sure first eliminate the answers that you know or suspect are incorrect. Then choose one of the remaining. If you can eliminate two of four answers on a number of questions, you'll get half of those questions right on average.

Note: Some will argue that this has nothing to do with increasing your IQ, but only your score. They are probably right, but as a practical matter, I would say that your "functional intelligence" has been raised by learning a skill (test-taking) that can help you in real life. By this I mean that productive use of intelligence is more relevant to life than some theoretical measurement of potential. - Steve

2. The second way to boost your average IQ score is to have the right conditions in place. Sleep well before the test, breath deeply through your nose, and sit up straight. These things are shown to improve performance on almost any test. Recent studies show that eating fish speeds up brain waves and increases concentration, so you may want to try that too.
If you are allowed music during the test, make it Mozart. Otherwise, listen to it just before the test. In one study, subjects who listened to Mozart's sonata for Two Pianos in D Major, K. 448 for ten minutes before an IQ test scored nine points higher. Do whatever you can to have your body and mind ready for the test.

3. The third way to boost that IQ score is to exercise your brain. This is a longer term strategy that assumes you can actually permanently improve your brain function and intelligence. It is a safe assumption in my experience, and in any case no harm will come from the effort.