Teacher's Gradebook - Additio

Hello Hunters !!
Today my hunt is regards to manage students data and grades and many other things through app called Teacher's Gradebook - Additio.
This app is really reliable and highly up to the mark and very useful for teachers.
Teachers can asses the performance of students, their grades, their attendance and even assignments, and yes timetable.
So teachers can use this app and make themselves comfortable. Because its highly recommended.