Volunteer tutor needed: physics for a motivated student in San Francisco

My son, Christopher, is 12 and in Year 10. Christopher loves school but physics has been a struggle since the school was closed during the pandemic. The university entrance exam is in August. We can't afford a private tutor, and the school's free sessions are full. We're looking for a volunteer who could spend an hour or two a week, in person in San Francisco or online, for about sixteen weeks. Christopher is polite, hardworking and eager. We have a quiet space and a laptop for online sessions. I'll always be at home for in-person sessions. If you're a teacher, student or professional who feels comfortable in physics, you could change the course of Christopher's year. Glad we found this place.