A chemistry tutor for Sosuke, 16, who's falling behind

My younger brother, Sosuke, is 16 and in Form 3. Sosuke loves school but chemistry has been a struggle since the school was closed during the floods. The school-leaving exam is in October. 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 Shinjuku or online, for about sixteen weeks. Sosuke 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 Sosuke's year. I never thought I'd be the one asking, and I'm grateful for every bit of support.