Free automated course from U of Geneva https://www.coursera.org/learn/particle-physics#syllabus

OP here: Has taken AP Physics at school in Sophomore year, also has calculus knowledge

You need to say more about your kids background: grade, did he take physics or calculus before etc.

For general physics after having some calculus knowledge I’d recommend dual enrollment at community college over AP Physics C. They do have summer sessions.

Try outschool

DC is interested in doing a summer course in physics-particularly particle physics/astrophysics. Is there anything available around? Not looking for AP courses. Thanks in advance!