Sure… the trick to scoring high is being familiar with the type of test and what they’re looking for. Solve some puzzles on the mensa website and take a few different online IQ tests, and THEN do one of the official tests, and you’ll be more likely to know at a glance if one of your answers fits what they think it should be or not.

But for the most part, unless you’re intentionally trying to understand a learning or thinking issue you have (with the assistance of a professional psychologist), or just find them fun, there’s no reason to take them.