I have used this website since a year. This is the best website I have ever come across. The best website for students and budding talents. Its helps in many ways for exam preoaration, doubt solving and asking experts. The curriculum and syllabus is up to date.
They have arranged the courses in a proper systematic way. The videos have good explanation. After that you have test series which is very useful and up to the mark. Also if you have doubts there are subject experts to clear it. In short this is a very useful website to learn new things quickly. A good value for money.