What is a "good" SAT Subject Test Score?

I just checked my SAT Subject Test scores.
I got 790 in Math II and 720 in Bio-M.

This was my first try, so I could retake the tests if I wanted to without making me look really desperate for good scores without much progress.
Are these good enough or should I retake it?
I’m planning on applying to prestigious & pretty selective schools like Johns Hopkins, UC Berkeley, UCLA, NYU, etc…

750+ makes it outstanding.

All depends on prospective major and school. 790/800 for Math II is good. If you’re thinking about being a bio major, you can consider doing a retake of the Bio-M- just consider whether it’s a productive use of your time or not.