Do not conform yourselves to this age but be transformed by the renewal of your mind, that you may discern what is the will of God, what is good and pleasing and perfect. The new school year offers an opportunity to renew the mind by gaining knowledge.
We also need to renew our spiritual lives. Spend a few minutes each morning before school (or work) in prayer, asking for help to discern the will of God for that day. Be attentive to His voice, guiding you toward actions and thoughts that are pleasing to Him.