Perhaps you could hang a ladder by the board for students to rate themselves against? CLICK HERE.
Levelled Question Cards
If you can personalise lessons and activities then it means you're catering far more effectively for every student in the room.
These questioning cards can go some way to achieving that.
Set students a task to do and give them each a set of these laminated cards. You could state what level you'd like each learner to be working at or alternatively, they could pick. You should state that you'd like them to make at least one level of progress before the end of the lesson.