Kenmore oven not heating to desired temperature

JgIkas-You need to check out the thermostat;; one way is to take a thermometerthat will go to at least 350 degrees( f )PLACE in oven and set for 20 min;; turn theoven on and set for 20 minuts;; at the end of the 20minuts if there is more then 25 degrees difference in the oven temp and the ,Then the thermostate will need to be adjusted,or replaced;; to stay safe call a appliance service person;; ;;I hope I have answered your question: LET ME KNOW;; GOD BLESS ::F.B.E.