How do you balance school and work?

I'm returning back to school for a science degree and working full time. As a preface, I already have my LVT license but don't see myself doing this for 20+ years with the amount of emotional turmoil it brings me and the low pay. This was my second semester back in school. I took precalc, spanish, critical thinking, and stats. It was very difficult and I felt like I never had time to devote to each class because each one required so much work. Unfortunately I sort of need to stay in this field for the time being to put myself through school but it is very difficult. I think I have good time management but maybe I could do better with it. I will admit I've never been the best at math so I had to work 3 times as hard in my precalc class than the other classes. I don't want it to take 6 years for me to get my bachelor's but at the same time the course load I had this semester was too much.