It's very hard to say what these birds are. None of them look quite right for Barn Swallow to me (no real sign of a breast-band, short fanned tail or one with only a shallow fork) and I feel they're probably Martins. I'd be very reluctant to claim a Common House Martin here unless the images were much better, as there are no records in Gujarat according to eBird, and no records of Asian House Martin either.
The bird that puzzles me the most is the one in the 1st image, as the underwing-coverts are distinctly paler than the flight feathers, as in a Barn or a Wire-tailed Swallow, and the throat looks buff with a suggestion of a light breast-band. The capped appearance and tail shape make it look more like a Martin though.
The bird in the 2nd image, on the other hand, seems to have darker coverts, so should be a Martin.
I can't put a name to no.3, but no.4 could be a Grey-throated Martin.
I'm not sure what either bird in no.5 is, although the lower bird looks uniformly brownish, so could be Dusky Crag Martin.