I get answers solved by my friends on the site. It is very interesting. Now they have also included online test series which is more fun.
There are many courses which u can join for free, but u can only join 5 courses at a time.
School course include from class 5 to class 12.
Nice site for students , I highly recommend it.
Entrance exam courses include GATE, CAT, UPSC, various govt. Jobs, verbal, quant etc.
And I love the most is that they are providing course in programming in their miscellaneous category.
However, I will say that this site is slow and I urge developers to give attention to it.