How reliable does /sci/ think Khan Academy is? I'm currently thinking of using it to learn pre-calculus before teaching myself calculus, with the hopes of learning higher level math subjects(for my own pleasure/hobby).
Is the site good? If you don't think so, please elaborate on your reasoning or simply outline the flaws it possesses.
Thanks in advance
If you need a skim of some shit quickly, it's not bad. Don't use it to review an entire subject or something, though. I see people that try to do that. You use KA to hear something taught in a different way after a lecture if you don't understand it at all, not to learn for the first time if you have the choice, IMO.
TBQH, I don't see the point other than to educate people in 3rd world countries.
Universities in first world countries have free tutoring, office hours... all of the damn students who can help you... I don't see the point of websites like KA for any university student for anything other than a last resort.
Im currently working through Precalc on KA.
You get exposure to a lot of stuff but theres not really enough variety in the questions and it doesnt do good for retention once a topic is 'mastered'.
If you are using it to learn (im using it as a refresher), id suggest doing it twice over so that you actually see how much you retain
Personally I use it as a supplement to my studies for concepts I have difficulty understanding.
Got to give it to Sal, he's extremely skilled at making difficult concepts seem simple as hell
Khan Academy helped me not fail out of high school. So yes. I should stress that it is merely supplemental; you can't get the same education with just some youtube videos and simple questions.
Very reliable, it helped me pass a few of my harder classes.
You don't really know if you learned the material until you test yourself on it though, so I wouldn't say it's a stand-alone teaching tool. You won't master all the subjects just by watching the lessons.