i don't want to be too mean. but you guys really need to practice. the group is always clashing in harmonies and dragging flat. the arrangements seem very weak with no real substance or chords.
i suggest listening to penn masala for insight on hindi a cappella. they are not excellent but very good and quite talented. i'm not in a hindi a cappella group (rather an english one called route9 at amherst college), but from my own acapella experience and group, keep working on the sound.
remember, music is centered on chords. you need bass, baritone, tenors, altos, and sopranos (as you have girls also). so form chords, thats clutch in acapella. figure out the key and have the bass sing the root, the baritone sing the fifth, tenors sing the third, and altos and sopranos singing octaves with the bass and thirds an octave higher
just some friendly suggestions. i may sound mean, but i love hindi acappella groups and hope that you get better
if there is a gap between the finite (us) and the infinite, music at least makes one believe not only that there is an infinite, but that he can reach it -- for he can feel it. fire, bliss, and conviction are the plants arising from seeds of music. music is a beautiful, beautiful thing.