As per my experience, I feel Chanakya IAS Academy is the best academy. Though yes we cannot rely on an academy for our complete preparation, Our hard work, determination is all that required. But still, I find Chanakya IAS Academy better amongst all. On 2nd number, i would place, Rao’s and Shriram. But my first suggest would remain the same, Chanakya IAS Academy. What I found best in them is, apart from giving classroom education, they are making the best use of E platforms and technologies. They everyday update question of they day, article of the week, current affairs, schemes, videos of successful candidates sharing success tips; and now they have launched LMS as well.
Check our their students resource page, you’ll get a lot of required material there.
http://www.chanakyaiasacademy.com/student-resources.html
https://www.facebook.com/chanakyaiasacademy