If u want to join teaching be prepared to do more than just teach. Based on my experience as a Reporting Officer, teachers are required to lead in initiatives in cca, pedagogy research and sharing, partnership with parents etc which accounts fr major part of performance. It is a given to teach well. Many mid careers esp assume that they will be well rewarded if they teach well but teaching well is an expected norm. To get C+ and B+, u need to be show contributions above just teaching well and that is where the other areas come in. as a teacher you wont see the strategic n organizational planning work like SEM and BSC work that hods and Shs do and thus have perception they are doing less for more.