chad"coursesaver" vs khan academy

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how to register? do you have a direct link to it? what is the difference between chad video's and coursesaver? am doing this for a friend I just want to be careful
 
which of these are better to use? I mean for chemistries and math. I just couldn't see much of a difference.
I can't speak of Khan haven't really used it except for random class topics in undergrad, but I ONLY used chads videos for DAT studying gen chem and organic chem and they're all you need to do well.
 
Thank you all, I really appreciate y'all taking your time to give me response to my quest, its a good guidance for my choice making. Regards!
 
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