Vidyamandir classes can be considered to the second best institute after Fiitjee as has grown over the years giving some fabulous results.It is mainly popular for it’s simple way of teaching and faculty.
But if want to join a coaching class in Delhi I would recommend it to be fiitjee given it’s more experienced faculty compared to Vidyamandir. Apart from inexperienced faculty also the fact that it’s administration not a great one it is less preferable.
But if you have no problem with this issues and want a simple way to study for iit it’s a great choice.