So you have to concentrate on Optional and GS papers for Mains preparation. Since, you are already acquaintance with your optional paper in your studies at undergraduate level; you need to do a deep brush up of the topics given in the UPSC syllabus of the optional paper. It's the General...
Essay on Cricket with water, education, freind, school, earth, republic day, new year, freind, independence day, lohari, raksha bandhan, water pollution etc.