I'm not as experienced as you fellas. My mathematics training is restricted to Calc1-3 and Differential Equations. But, I did AP test out of Calc1, but had to take it anyway because the AP test was only good for regular Calc 1, but I had to take Calc 1-3 for Engineers. Then, a few years ago, I took some classes at a local junior college, and took Calc1-3 again, and Aced them all. I took Calc 1 to be supportive of my wife who had to take it for her degree, and then took 2 and 3 because I enjoyed 1 so much.

I got as far as something they called Distributed Systems. It was basically differential equations in 3-space. Y is a function of X, Z is a function of Y. Write an equation describes Z if dx/dt = sine t.
Or something like that. It's been a long time.