Notice he's asking on a basic level. At least number theory is not required on a basic level.
My advice would be to pick up elementary textbooks on each of these subjects and skim through them to see what you need. In some cases, the math you need will be covered in the book itself.
For instance, check out Griffiths for particle physics, Zwiebach for string theory, for quantum field theory, I don't know what the most basic text is, for general relativity, there are many choices, two that come to mind are Carroll and Schutz. Loop quantum gravity is less popular a theory, so I doubt there is an elementary text about that. I suspect a strong understanding of general relativity and quantum field theory is required for even the most elementary study.