I smtructure school like it's a job. They get an allowance each week. That allowance is earned by #1 school stuf, #2 chores, #3 behaviour, and they have that explained to them.
If they are not doing good in an area then the allowance gets lowered (like a paycut) until they get their shit together and start peroforming. If they perform excellently they get a bonus at report card time.
They get a raise each year at birthday time along with an increase in responsibility and an increase in privileges.
I try to make it as much like a regular job as possible because nothing I ever learned in school ever prepared me for dealing with getting a job and performing at a consistent level on a regular basis.
Still don't know how to get them to realize that they don't get summers off in the real wordl...lol... That one is always the shocker