It really depends on the curriculum.
Most text books have a teacher version that have lesson plans, suggested homework, projects, etc.
If you could get a hold of those versions that would be a great help. Perhaps his teachers at school could help. In other words, if he reads a chapter in a social studies book, have him write in his own words what he learned. This could include writing an outline, overview of important points, his opinion on the matter etc. Hello out there.