Changing Mastery To A Passing Grade Level (75-100%) Instead of Just 100%

 I'd like a feature added so that parents can change the Mastery Level to an actual passing grade instead of having to have 100% correct to pass.

In brick and mortar schools there is a grade scale. I would love that feature to be available here on Khan.

Now, when my children try to complete a lesson, they may get what would be considered anything from a C or even an A and still not get credit for passing the lesson unless they get 100% So they get frustrated and want to quit, shut down and sometimes even cry. This makes for MANY bad learning days EVEN though they had actually passed the lesson.

I wrote in and asked how to change the Mastery Level but was told this feature isn't available. I was encouraged to post here and hope that other parents/coaches would like the same feature. 

Please support this post in hope that we can set our own standard of acceptable mastery on our child(rens) account.