Instructor talks very fast, without any prepared noted, just a bunch of mumblings. You can find much better instructions on youtube. If this instructor kid had these videos for free on youtube I would not watch them. The online quizzes are a disaster, put together without any connection to material, seems that the only though was to make questions as confusing as possible.
I highly recommend to stay away and dont waster your money. Go to youtube and find Stanford - Developing iOS 8 Apps with Swift