This link should point to:
khanacademy.org/sat
That's the new system.
khanacademy.org/sat
That's the new system.
https://www.khanacademy.org/sat
If you want to "get into the details" you'll need to be logged in and complete the onboarding, through this URL:
https://www.khanacademy.org/mission/sat
I mean, linking to the current URL is fine, but it's not what was actually released nor is it representative of the new content.
(Disclaimer: I work at Khan Academy)
(Sorry khirasaki; I get what you meant now.)