Highest level of mathematics you've mastered?

I haven’t had my morning coffee yet, so I’ll get back to you when I translate your question. Geez! You really know how to confuse we pitiful souls!🤯

Business calculus and statistics at community college

10th grade - Calc1

(I'm so glad I'm not in school anymore!)

So, it all started with Differentiation By Parts and Vector Equations, and ended up with Fermat’s Theorem.

I took a second year Calculus course as I thought about studying Engineering.

Algebra

Calculus 3, ordinary differential equations (I wouldn't say I mastered them but I got a B in an intro course 20+ years ago).

I wanted to be a math prof. but discovered I hated doing proofs and abstract algebra type stuff.

Ive transcended mathematics. I fashioned relative mechanics and have disproven the concept of a 3 dimensional reality.

But I loved all my Trigonometry and Calculus. Math is my shit.