I am a college student, but I have always suspected that my IQ is low. What should I do?

Because your mind is solidified. Treat different things with fixed thinking, everything has its particularity. Treat everything with inherent thinking, you will be at a loss, and even feel that there is something wrong with your IQ. It's time for you to change your way of thinking. Join a club or something, such as model association or starting a business. This will be of great help to you.