The next time you think you did less than well in a IQ test, fret not ! Because intelligence is not a fixed quantity !
The IQ test that we all undergo owes a large part of it to the Binet-Simon Scale, which was jointly researched by Alfred Binet and Theodore SImon. They both stressed that mental development progressed at different rates and could be influenced by myriad factors, noting that the result of the test is only valid at that particular time of taking only.
With that said, IQ constitute only a small part of our lives. It is more important to learning how to learn instead.
never stop learning
Source : The Psychology Book by DK Publishing