Signing in with multiple Google accounts.

First, you'll have to log out of the Google account you're in. Then, on the log in page, you'll click "Log In With Google" and then either select the account you want or click "Choose Another Account" then type in your email. Then, you can log back into Google with whatever account, but then you're in the correct Khan Academy account!

Hope this helped!
-SP

It still uses the same account automatically.