If I take the same psychological test two days in a row will I get the same results?

If most people were to take the same test twice they would likely change their answers on a few questions, however their your results on psychometric tests, measuring personality for example, are likely to be based not on how you answered one or two items, but rather your answer patterns across many items.

Generally speaking on valid and reliable psychometric assessments the similarity of profiles between test one and re-test two, even when taken months apart, should be high.