Yes you could plan it yourself. It might stop the recent experience I had of watching interviewees presenting the same lesson. What could you do that will show that the children have made progress? Difficult with shape unless you have some good differentiation. What is on the planner for term 2 second half? Or even term 3 first half? What sort of things will come up in Sats? You might like to try symmetry or rotation. Both these can be delivered in a fun practical way together with a task that will show they have learnt what you teach. Good luck.