The document discusses differentiation in lessons to achieve higher grades. It considers targeting questions, problems, and resources at different levels to meet the needs of all students. While current practice focuses on success for weaker students, pitching lessons too high could damage success rates. Therefore, more able students must be challenged within existing lessons. The document outlines differentiation levels of "must, should, could" and considers how the teacher or student might decide the route through the lesson, targeting different abilities and goals.