Yes it is better option for an student who looks for iit jee preparation. Because of well programmed shedule, highly qualified teachers.
But it is popular only because of it’s advertisements till now, and they also not shows better performance till now, I call it just an average, I only suggest you that if you are going to kota only for preparation of iit-jee then there are many other choises is also there in regards of cochings. And at last I only tell you that it is only depend on students that how much he/she getting from the teachers that’s it.