I do not know about Rato Bangla but St.Xav, Mary's, and select few others are handful of schools dedicated to education. No disrespect to students  from other schools (especially government school, they are financially handicapped so we shouldnt even compare them)  but rest of the private institutions are money making, industralized farm. 

What makes St.Xav/Marys better is because of dedicated educators, systematic/organized/experienced workforce and relative segreation from the politicized infrastructure. This system grooms adoscelence to enter maturity, atleast it gives you a better shot at doing it.

So, my argument is ,

-- Coming from a good school doesnt equate to good individual/student.

-- Being educated in "industrialized ambience" doesnt neccessary make one inept or incapable, large factor of it depends in individuals urge and desire.

-- I do concur that coming out of  organized/capable institution gives you a better shot at being successful in any aspect of life, it helps you make unbiased/balanced decisions.

I am former St.Xav student and obviously my heart sings to its tune but one thing I have realised is that the education strucure that I went through in the early and late 90s is still as good as here in North America. We are educated in so many extra curricular activites, it has helped us adapt to different scenarios.