Hello there! While I do feel most coaching classes teach approximately the same way and use the same methods, I would advise you to avoid some of the big names such as FIITJEE or Aakash. I myself joined FIITJEE four years ago and got lost in the mountain of students. The lack of personalized teaching is astonishing, especially since such a model would guarantee maximum selections. Join a local institute with a steady record of selections. I would suggest IIT Point, Sinhal Classes or Vidyalankar. IIT PACE is also decent, but you have to put in the hard work from your side.