Is this a joke? @khanacademy
I'm so close to complete The World of Math journey but, Mastery Challenge is automatically generating the questions of the old topics all the time.
Why? Don't you want me to complete it? 
pic.twitter.com/VAXyswqogh
We definitely want you to complete our mastery challenge! If you still can't get it to load the right questions, try submitting a ticket to our help desk: http://khan.co/KA-support Let us know how you go!
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Actually, asking of the old questions makes my memories fresh. I've changed my mind. I have no complaint about it. I think when I mastered all of 1422 skills one more time, then I'll complete totally. And education never ends. So I need to study more. Thank you for your response.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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