Volunteer tutor needed: chemistry for a motivated student in Kikuyu

My younger brother, Kevin, is 12 and in Grade 11. Kevin loves school but chemistry has been a struggle since the school was closed during the move. The national exam is in March. We can't afford a private tutor, and the school's free sessions are full. We're looking for a volunteer who could spend one or two hours a week, in person in Kikuyu or online, for about sixteen weeks. Kevin 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 chemistry, you could change the course of Kevin's year. Whatever you can give, even just sharing this page, means a lot.