How hard is it to keep up with online math classes for adults while working full time?

Getting back into studying after years away from school has been tougher than I expected. I signed up for online math classes for adults thinking I could handle them alongside my full-time job, but the schedule and pace are wearing me out. It’s strange how much harder it feels to focus now compared to when I was younger. I’m trying to find ways to stay consistent without burning out or falling behind. For anyone else juggling work and online math classes, how do you manage your time and motivation?