With some quick Googling I was able to determine that 7k-8k rupees is equivalent to an $130 to $150 USD price range. It seems that the bikes you are looking at are full suspension mountain bikes, and look pretty similar to the bikes sold in department stores in the US. Bikes in this price range are generally not found on review sites because they are pretty much bottom of the line, and there isn't much good that can be said about them.
For that price range you are much better off buying a used bike that is of much better quality. If you want to buy new, I would stay away from the full suspension mountain bikes because the suspension isn't that good anyway and the money you'll save from the lack of suspension means the rest of the bike will be better quality. Plus you'll probably save quite a bit on weight.