I’m 27 and finishing my MBA right now. I have one daughter and another kid on the way, and also work 50+ hours a week.
I say all of this to say that I am sympathetic, if not empathetic to your plight.
I’ve found that I need project management/planning tools to effectively coerce myself into working smarter. I use a project management tool (free!) called Trello. It allows me to plan the work that needs to be done. When I have a plan of attack I feel less overwhelmed. Sticking to that plan is a whole different story, but breaking the work down into manageable chunks has made a world of difference for me.