When I sit to take a math test I usually just take my time. Write out every piece of work you do even if it is done in your head, and use your calculator whenever you can. Also try and check your answers as many times as you can to make sure you didn't make "stupid mistakes."
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The standard IQ tests are calibrated with Elizabeth vos Savant (supposedly the smartest person alive) at 200 and no score above that is possible with these tests. Therefor a IQ of 218 is not possible.
IQ tests
Dose response tests are used, which are a kind of statistical tests.
The experiment tests the hypothesis.
What is DC parametric tests