It cant be used as a totally means for tution but it can be useful in getting notes which are really good on this website as I used it for some chapters of my 12 class for chemistry. Logging in for free in this then you will get access very little things which you want but for the enitre syllabus you have buy the membership which costs a few money. Overall I guess its usefull only for spontaneuos usage like notes, videos etc