Almost all schools have reward & punishment systems, but the difficulty can be to notice and acknowledge the silent majority who generally get on and do what is expected of them without a fuss. There are a number of schemes on the market, which seem to offer some hope with this.
It could well be Vivo Miles, which is being used to great effect in several schools. The advantage is a lot of it is done electronically, so your quiet, conscientious students are rewarded automatically, without involving masses of admin for staff.
So many schools choose to issue Vivo Miles for regular attendance and punctuality, which can all be calculated electronically by the computers.
In addition, teachers can give Vivo Miles as rewards for particularly good pieces of work or behaviour. If the school is having a drive on uniform, they could get form tutors to monitor uniform for a week, and then issue Vivo Miles at the end of the week for those who have perfect uniform all week.
Students then collect/save-up the Miles for something they want. It might be 'plastic tat', or it might be something like a cinema voucher or a mobile top-up.
there's lots more information here.