Intelligence to me has always meant the ability to quickly absorb and apply new information. Best test I ever took for this (imo) was a kids mensa test I took forever ago on the assumption it'd look good on a college application. They tell you a short story at the beginning of the test, let you read along if you like, and then give you an hour and a half of the standard math, spelling, reading comp, and logic questions. Then the last 20 minutes they spend grilling you about the story from the beginning, with intentionally misleading questions and open ended prompts that leave plenty of room for you to hang yourself. The whole point was to see how well you absorbed the information after a long and mentally taxing distraction.

Jokes on them. I ended up going to community and falling in love with welding.