I'm a single mom of four and full time student, but I don't work, so I do have more breathing room than you will. Still, I have some tricks that might work.
If at all possible, find work where you can study part of the time: laundromat attendant, tutoring center at school, coffee stand barista.
I go to sleep with my kids so I can wake up an hour to two hours before they do. This works for me because I'm a morning person. Most of the time I reserve at least half an hour for self care, which I'm very serious about- I discipline myself to do what will restore me.
I cosleep with my youngest, six, and take a bath with her every morning. The others keep their cups full with hugs, high fives, and longer talks on the weekends.
My kids have a regular six hour school schedule, during which time I do Only School. No errands, no socializing, no going home for a nap after class.
I take math and science classes, which are a ton of work and difficult. I deal with it by being very proactive about my learning. I read ahead in the text before class so I at least have a clue what the professor is talking about in class. I write down everything the teacher says, all examples, everything- as if I were going to have to teach someone else the material using only my notes. Then I review my notes every day. I never miss a day of just at least reviewing the lecture notes on the current material.
The kids help me with the cleaning. Our apartment really deteriorates over the week, and then we do a big cleaning on the weekend.
Dinners are very simple- half the time we don't even use plates! If we're eating ice cream, out comes the container and spoons, and everyone gathers 'round. I don't need to spend any more time on dishes than I already do!
We go up to get ready for bed an hour before lights out time. This gives the whole routine a relaxed pace, allows for contingencies, and gives us the time to hang out without distractions and read a few chapters in our current book.
If there are any concerns in the family, such as arguments or discipline problems, I call a family meeting. We have one every day after school if we need to. This keeps us connecting regularly and all on the same page as far as rules and treating each other respectfully, etc.
Mama to: Aster , August, Emmett:, Ruthie: Step mom to Malakie, Cameron , and Aurelia