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One is expected to score higher in an ideal standardized test if they prepare for it. One should not be able to score higher in an ideal IQ test if they prepare for it, since IQ tests by definition evaluate an innate ability.

Of course, in the real world no IQ test is ideal.

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Don't confuse the properties you'd like the tests to have with the properties they do have, or with the properties they need in order to serve their purpose effectively. No effort is put into getting IQ tests to resist practice effects or knowledge of the structure of the questions, because taking the tests is not common.

Mountains of effort go into the same project for standardized tests, because taking those tests is common, and the whole point is to evaluate people for what they are rather than what they would like you to think they are.

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