Not sure why more kids don’t do this. Institute classes were fun, easy and free. The ones I took were graded but if you showed up you’d get an A. You have to take certain ones to get credit but I know they still do it because I serve in a BYU ysa stake and we have institute weekly and some classes offer BYU credit.
I had a few tough religion classes and once I discovered institute I only took a couple more elision classes at BYU.