An accounting tutor for Riley, 13, who's falling behind

My younger sister, Riley, is 13 and in the final year of school. Riley loves school but accounting has been a struggle since the school was closed during the strikes. The SAT 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 one or two hours a week, in person in London or online, for about twelve weeks. Riley 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 accounting, you could change the course of Riley's year. I never thought I'd be the one asking, and I'm grateful for every bit of support.