Studying Physics at a Japanese university

Hello, I'm a Junior Physics major at the National Autonomous University of Mexico. I'm planning on studying a semester in a Japanese university as part of an exchange program.

My university has agreements with Tokyo University and Osaka University. For those that have studied at these universities: What has been your experience? What are some recommendations you can share?

I have a JLPT N2 certification, however N1 is required to take (science) courses taught in Japanese at these universities. So I'd also like to know if I can audit these courses or take a language examination in situ to take the courses properly. Also, do English-taught courses have a lower or higher education level compared to Japanese-taught courses?

I'd continue with more questions with the people in the comments.

Thank you!