Nearly every school uses tests and grades to determine how well students have learnt what's on the syllabus. It's another debate that this approach simply gets students to test well rather than actually learn concepts for the long term. But the concept of grades to determine how someone did on a test is well established. 

I've been planning my weeks for several years now in terms of what I ought to get done, and looking back and reflecting on it to see how I'm doing and where I can improve.

At the start of this year, my friend, Aditya, suggested I start grading myself each week. At the start of the week, I have a list of things that I set out to do, and at the end of the week, I grade myself on how I fared in getting them done. 

This has been an effective way of reflecting back. 

Looking at the grades, I can see at a glance where I'm doing well and where I'm not, and use that information to plan future weeks. 

Grades used to work on me as a kid, and it still does. 

This is a type of gamification that several apps (like Duolingo) follow nowadays to keep their users engaged and progressing. And weekly grades is a personal version of such gamification.