I am having several issues here.
First: I just created an account for my 12 year old son. My account is older, from 2012.
For some reason my son can't join the classroom I created.
Also for some reason, on the top of the site "subjects" I am unable to choose anything more advanced than 3rd grade?? Why is that?
From what I have found: When the Adress bar shows "https://nb.khanacademy.org" the subjects are restricted to 3rd grade. But if i remove the "nb" "https://khanacademy.org" all the courses are available. Why or what is doing this?