Here's a few ideas: Try steep S turns rolling in and out without yaw, stopping each turn after a desired compass heading is achieved (say <180 degree turns). Lose no height and predict and compensate for the turning error on each turn. We also have to do a slow flight demonstration, straight and level at <10k over stall speed (stall warning should be on). Learn how the plane responds on the backside of the power curve in slow flight, the mushiness of the controls should be obvious. Do a gentle (rate one) turn in slow flight, learn to handle the plane smoothly -use more rudder and see if you can keep wings level with rudder alone. (Be prepared for a wing drop if you manhandle the controls and make 'stepping on the ball' second nature in a stall).
You should talk these exercises over with your instructor first to make sure you are up to them.
Enjoy your free flight!