Okay algebra and geometry but other than that, spend time practicing addition and subtraction, multiplication and division. That’s 99% of the math you’ll need to know if you’re not going to be an engineer, etc.
Your spouse will be absolutely unbearable roughly 10% of the time. So will you be, by the way. Give grace. Receive it too. Also, physical distance helps, even for a few hours.
My Nana, born around 1913, used to decry “some people think the world owes them a living.” A hundred years later I agree. Nothing worse than entitlement.
Sometimes it just takes a while to catch on. I had to watch Game of thrones 3 or 4 times before I could keep track of all the characters and subplots. Record your lectures so you can replay them a few times.
Tube first 2 or 3 years of your life I would sing to you after bath time as I was getting you in your jammies. Two songs: Oh Shenandoah and Danny Boy. Rubbing your tiny little feet with baby lotion while singing to you is one of the happiest memories of my life.