Sorry I didn't explain too well. That link is to an online demo server of the Kolibri app that has that channel imported.

You can get the same channel locally (localhost; for offline use) using the following steps:

1. Download Kolibri https://learningequality.org/download/ , 2. Install and start, 3. Go to Device > Content > IMPORT and choose the channel called "Khan Academy - Standardized Test Preparation" from the list, 4. wait for import process to finish, then you're done.

I posted the same info in another comment on this thread of this story so I didn't want to repeat here. See that for more info.