It looks like they did away with the mastery system for the banner thing?

It's quite possible you're missing something from more fundamental maths. When i went back for an engineering degree i found through Khan academy that i needed to relearn 4th grade fractions. I just worked from there through every lessen from 4th grade up through calc 1 in one go. Took like 3 months but college level calc and above was a breeze with that strengthened foundation of knowledge.

Then when other students asked me for help i saw them having the same issues. It's really hard to tell an adult they need to work on 4th grade maths when they're studying for a calc exam. It's not their fault the classic education method gives you Swiss cheese knowledge.