The last two certainly look genuine. They are Jammu and Kashmir 'New Rectangulars'. The first one is a half-anna official stamp, which was issued on both wove and laid papers, and the last stamp (which is upside down) is an eighth-anna postage issue.
The rest are indeed imitations of fairly modern production and virtually worthless even as 'reference'.
Peterh is right - all but the last two are modern fakes, and quite worthless (except for a non-collector of Indian States, in which case, they might serve as references).
Note that the supposed Duttia (three first on the second row) are supposed to show a seated Ganesha.
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