Airspeed management is critical. If you approach at 75 when it's supposed to be 70 you need to lose that speed before you can ask the plane's permission to consider re-acquainting itself with Mother Earth.
Plus, at higher speeds your elevator is more effective. So less elevator input needed for the same pitch up moment. In other words: A pitch input which would be perfect at a proper Vref, will lead to a balloon at Vref+5.
Nail the speed at the POH recommended speed (and don't blindly add 5 knots for the instructor and another 5 for the wife and kids) and you are halfway to a good landing.