I am not a big fan of self-studying for APs. Self-studying for one or two might be okay, but only if it does not take away from (i) getting your school work done, (ii) participating in the ECs that you want to participate in, and (iii) getting enough sleep and staying sane.
I would be cautious about self studying for APs.
By the way, it was a very long time ago, but in my experience regular freshman year physics at MIT was very good and very well taught. It would be well worth taking and I am glad that I did not AP out of it.