Please update the percentage % system and add a go back feature.

Please remove the scoring it's drives me crazy when I'm rushing and accidentally answer a question wrong. You guys don't have a "go back" feature so in order to improve your score, the user is given no choice but to retake the whole course section just to fill in the missing %. This is very discouraging because it distracts someone like me who aims for 100%, and it feels like it's a strategy to keep me in this website instead of focusing on learning. I like this website and what it fights for, my only issue is the feature. I'm not asking for it to be removed but improved. I would be fine with just having it as a form of feedback to know where I am in my course.

(Or instead generate an alternative problem until the user gets it, so it won't hurt their %,)

For example:

Wrong question= alternative problem

User should be allowed to skip the alternative problem

If user skips = -%

No skip + Correct answer = +%