Let me share one of the quickest ways to tell how intelligent someone is.

Try to observe see how long and how well they can listen to or consider someone else's point of view without getting defensive.
Curiosity is a good indicator of a sharp mind.
Most people with Low IQs think in a one way direction or what you might call "single frame"
Assess yourself -- if you observe that you are already finding a way to defend your point of view, even before the other party has finished speaking, then u most probably have a low IQ 🤣
This is because even before hearing the other party out, your brain is stuck with what it thinks it knows, what it has accepted and what it believes.
This leaves no room for further thought, new knowledge, questioning the status quo and can block learning and growth!