I'm actually on the same boat. My plan is to take a few courses up to a rigorous understanding of general relativity. Multi variable Analysis + Linear Algera(r

I'm actually on the same boat. My plan is to take a few courses up to a rigorous understanding of general relativity. Multi variable Analysis + Linear Algera(review)-> Advanced Linear Algebra (graduate level)-> Vector Analysis for Tensor; Also a course for introductory Differential Geometry. For physics it's Classic Mechanics-> Electromagnetic -> Relativity (special and general) So about 6-8 courses. Some are graduate level but most are of undergraduate level I think.