Mixing it up is the way to go. Most instructors make the same mistake their instructor made - goin' round and round the patern over and over or just doing the PTS maneuvers with little or no imagination of making up scenarios or doing stuff in the airplane flying handbook that we are supposed to be teaching anyway.
Slips, cross-control stalls, forced landings on take off with runway remaining, and on the climbout with enough airspeed/altitude to make a turn-around to the runway, an infinite variety of stalls with different speeds, power settings, flap settings, straight, turning, chandelles, lazy-8's, power-off accuracy,...now there's one guaranteed to hose down the burn-out. Get into an accuracy contest with your student....