Actually If you are strong determined then one month strategy making is very important for you because Last month of upsc is very crucial you have to learn every important aspects of your exam also prepare A LIST OF POINTS TO REMEMBER so that you can qualify your exam with ease Important points and test series and previous 6 months current affairs helps you a lot also you can purchase some notes of different authors so that you can understand the main structure of exams through a good website like http://www.notesfocus.com , ebay , amazon which are very famous these days Also olx will have old notes but I think go for updated notes as these notes have less number of errors . Also at last do your hundred percent because you do not have the nature that i can do that but not have done because everything is possible to achieve if you have focus on goal.