Quick answers to your questions:
1) Can the videos lessons be buffered, like in youtube, or downloaded? I have a slow internet connection so I wont be able to get a smooth streaming i guess, hence asking.
The videos buffer but cannot be downloaded--that's how we ensure someone has completed the course. Students from around the world have taken the course; if you have trouble, let us know and we'll investigate with you.
2) How will they keep track of what all classes/course contents I have completed?
The videos are embedded into our course, which tracks everything you do--including videos, homework, and CATs.
3) Is there some kind of 7 day trial thing so that we can get a feel of how Knewton
Not really. The 50-point guarantee is there to allay your fears. You'll get the results you need or your money back. You can go through the course as fast or slowly (up to four months) as you'd like.
4) Also, are all the videos classes accessible at once, or new classes will be unlocked as the course progresses?
All work is available immediately upon starting.
Good luck with your preparation!
Email support [at] knewton
[dot] com if you need help at any time.