Mathematical analysis and advanced algebra are the most basic courses and are very useful. You must learn first.

Learn ordinary differential equations again, and choose someone to feel good.

It is difficult to learn real variable function, complex variable function and abstract algebra at the end of the term, so it is necessary to learn several fractions well.

Differential geometry I don't know whether you are talking about space geometry or geometry in mathematical analysis. Space geometry can be studied together with the scores of higher generations.