Vibrant is one of the most reputed iit coaching institute of India, it is mainly because of it’s owner the 7 seven HODs who are considered to be one of the best teacher’s in India. I have studied for 3 years in the institute and according to me it is the best institute for chemistry in India though slightly poor in Inorganic department but organic is just too good. Maths in almost all the institutes is at the same level, Vibrant can be considered to be just better than the most but surely not as good as chemistry. Physics is just too poor the faculty of physics hardly has any iitian.
Apart from all these the review tests conducted almost every month are nowhere close to the jee paper they are more the questions of formula rather than concepts. The DLP is better than most institutes but I would recommend resonance for DLP.