My Child At School (MCAS) Parent App

My Child At School (MCAS) is Chesham Grammar School's new parent portal, and will be rolled out to current parents ahead of the start of the new academic year in September 2026. 

Parents will be able to access real-time student data performance for their child(ren), such as attendance and attainment data, timetables, exam timetables and behaviour points as well as general useful information about CGS including the academic calendar and communications.

Please read this MCAS Parent Guide for support with accessing and navigating the system.