Thanks! I think one problem of self-teaching is the difficulty to 1) Figure out which parts of the textbooks are needed and which parts can be shelved; 2) Find

Thanks! I think one problem of self-teaching is the difficulty to 1) Figure out which parts of the textbooks are needed and which parts can be shelved; 2) Find a good textbook with detailed answers; 3) Find someone to ask when blocked. I totally agree that a good teacher is at least a 10X multiplier. My plan is to register as an independent student, takes 2-3 courses to show serious business and then find a professor with GR background as a mentor. I don't think it's worthy to get into a program because I'll have to take a lot of off-topic courses then. The simulation is also interesting. I remember someone programming a renderer for black holes based on GR (or something else) and it looks exactly like the one in Interstellar!