You can join any coaching center depending on the location. There are a lot f coaching institues that are spread all around delhi like Fiitjee, Brilliants, Pie education , Bansal classes , Sri Chanakya , Sri Chatanya and various other institutes.
Just be sure that the have a good faculty and should be convenient for approach so that u do not end up wating a lot of time in just travelling.
Rest the course of all the institutes is always the same.
Best of Luck for ur career....