Most POHs, like my C172 POH, have tables for different weights (I.e 2200, 1900 & 1600 lbs) in which has data such as ground run, best rate of climb etc... can be ascertained. The performance graphs themselves differ for each specific aircraft and really depend on what equipment they're carrying.
How come you're doing it for a C172? If you're doing the CPL should it not be a C182 or PA28 or another type of aircraft the has a CSU and cruise speed over 120KIAS?