Life at an IIM
There's no 'BEST' here. Every individuals choice differs. I personally recommend 2IIM as they have 2-3 faculties who can give you the maximum guidance.
Also, Shweta Di took coaching from time institute, Hudson lane.
Hope this helps!
You can also refer to this survey for some inputs - https://www.non-engineer.com/post/best-cat-coaching-survey-results
Honestly takshila t.i.w.y.s is the best out there man!