student grades

Normally in all schools ,teachers are rank the students based on the his/ her participation of the class, behaviour of the student and how he/she can wrote the exams.Now a days most of the students addict for drinking,smoking and wing tobacco products.Because some of the students think that ,these all are for fun and some of the students think these relives stress.Ranking based on his/her own habitual actions is not the good decission.Because no body knows for what reason prticular student can drink,smoke,wing tobacco products.Mainly teachers are focused on only how they are participate in the class subjects .