Hey all,
I have one tech elective left, and I would like to take math course. So far in my curriculum I have taken

Calc 1, Calc 2, Calc 3, ODE, Linear Algebra 1, Stats 1, from engineering department

Computational method for PDEs from applied math department.

I'm thinking of advanced stats course or maybe calculus of variation. What other courses would be good to have in your bag? I'm never going to return to uni afterwords I think.

Friend of mind also recommended real analysis course but I have no idea what that is.