Factory Maintenance tests?

Is anyone here in maintenance?

It’s like my dream job, but I’m always worried if I’m even smart enough to do it.

I heard that employers give a competency test, to see what you know.

I’m kinda dumb, I barely passed my technical schools math classes and even failed one, I mean I’m capable of doing math, it’s just kinda hard for me.

I was just curious what kinda questions are on these tests the employers give? So I can better prepare for one.