Teaching a group where the levels are three years apart

Tutoring groups are formed by timetable and geography, not by level. The result is normal and awkward: within one group, a student comfortably ahead of the syllabus sits next to one missing the prerequisites from two years ago. Teaching to the middle serves neither, and preparing three lessons a week is not sustainable for anyone who also has to eat and sleep.

Vary the task, not the lesson

The sustainable answer is one explanation and differentiated practice. You teach the same concept once, to everyone, at full difficulty, and then the practice fans out. This is a fraction of the preparation cost of three lessons and it captures most of the benefit, because what genuinely differs between your strongest and weakest student is not what they can be told, it is how much scaffolding they need to use it.

Three practical structures

• Same question, different starting line. Everyone gets the same problem; some get it with the first two steps already written. The end point is identical, so nobody is doing visibly "easier" work, which matters more to teenagers than any educational consideration.
• Must / should / could. Three tiers on one sheet. Everyone starts at "must", nobody is told which tier is theirs, and the sheet is designed so that finishing "must" is a real outcome rather than a consolation prize.
• The strong student explains, but with a job. Not "help him", but a specific task: "ask him what the first step is and do not tell him." Undirected peer help turns into one student copying, which helps neither of them.

Protect the ceiling

Mixed-level groups usually fail upward: the pace settles at the weakest student and the strongest quietly disengage. They rarely complain, they rarely misbehave, and they leave at the end of the term. Whatever else you do, make sure every session contains at least one thing your strongest student cannot do immediately.

Know the spread before you plan for it

None of this works without a diagnostic. Guessing the levels in your group is guessing, and the students who most need scaffolding are frequently not the ones who look like they do. Fifteen minutes of prerequisite questions at the start of the term tells you where the spread actually is, and the plan follows from that rather than from an impression.

Sources

• What Works Clearinghouse — Educator Practice Guides (US Dept. of Education)
• OECD — Education and Skills