I’m pretty old to write a review on this. and one more point before I start (or you). this is regarding the agrawal classes based at dadar.
actually i’ve never been to their dadar classes. when we were students they used to offer a postal tution service with special interactive sessions thrown in a couple of times a year.at that time it was considered to be one of the necessary (but not sufficient) things to get into iit.
what attracted me most was their short but complete coverage on all the topics. they were definitely following the maxim that an interesting speech should be like a lady’s dress - short enough to draw everyone’s attention and long enough to cover all the vital points.
their notes were definitely one of the best -probably prepared by really good teachers. their interactive sessions were also good. the best part was their regularity. though we were at the other end of the country and they were totally dependent on indian postal service for delivery , I do not remember a single case of miss among my friend circle.
i do not know why they stopped that service after some years. but on the basis of my experience, they were really worth the money they were charging.