I think gap year undergrads that are good at this could consider volunteer tutoring HS kids. Some of the gap year kids will not have jobs, and are probably upper middle classed. A few smart kids could create some kind of non profit organisation to offer such services in their communities (online of course). Start with title one schools, match with a kid or two or run tutoring small groups for specific subjects. This could have a parent organisation that helps the small groups organize.