The constitution of India is a must read for every aspirant because of two reasons. The first is it covers a lot of information which will be asked in General studies. And the second is as a responsible citizen and an aspiring civil servant it is our duty to know our constitution fully. Our constitution is freely available in PDF format on Indian government website, but as usually in parts. So I combined all of them and made it into a single PDF so that you can download it at once. So following is the download link.