Khan Academy

Khan Academy helps the user in educating from the fundamentals of the subject. The user has an option to choose a particular lesson from a particular subject so that the user don't need to go through the lesson or subject that he has an acquaintance. The videos are in high quality so it's better to view.

Khan Academy is filled with bunch of videos which is good for a learner but their sorting feature nor the search engine doesn't work properly in finding an appropriate video. And they also charge high which doesn't match with the budget allotted by the users. It also lacks several videos in certain lesson and chapters.

Khan Academy can be an alternative to those who don't have time to attend the class nor missed the class due to several issues but it won't be helpful for a regular student since it just a recorded class of a person summarizing the concepts in a lesson and very few videos are animated.