Add a bookmark or pegging feature where students can control where they are at in a course. With this feature, a student should be able to add a peg to any item (folder, page, etc.) to indicate their progress in the course.
Schoology helps teachers ascertain where students are at through the "Mark Complete" button, however, students may accidentally view an item or teachers may not have assigned any Student Completion Rules for the students, making it difficult for them to determine where they currently are in within the course.