Perfect school is when students are fine with their grades or GPA rate. Some student have fine at school but there are others that hate school and this is when teachers have problems to teach them because they do not care school they only go because parents punish them.
to incentive those students we could do many activities like bring present or gift because students love gift and they will do any thing to get it and it could be the motivation to increases their grades, but this won't be mandatory. this challenge could be only for students who really need improve their grades because there are students who are a great students and they ready have the motivation to be success.
A good change that we can do at school is to bring a time to do homework because some students do not have time at home to do it and it is why their grades decreases, it is not for everyone but there are some students that have to work after school and when they arrive to their home they fell tired and homework is that less thing what they want to do, so bring a little time in the school can support a lot these students.