I will share some suggestions that I feel could really help you. Not all of these suggestions will be exactly suitable to you. You can modify some suggestions to suit your own style/approach. I will attempt at giving a broad framework or strategy rather than the specifics. Feel free to tweak the framework if you deem it rational.
Read the Full article on UPSC IAS CIvil Services PRELIMS STRATEGY: Kumar Ashirwad, Rank 35, Prelims GS-1 Marks 140 (2015).Alternatively you can compare our suggested books list too .