a.o.a. I hope u r fine and enjoying ur studies.Dear, u ve to go through the whole of required syllabus as early as possible.If u r going to appear in the upcoming CSS exam.then it z time that u finish ur study of optionals before the end of December.then in the last two months you would be in a position to revise ur optionals with ease alongwith putting full focus on compulsory subjects especially English and Eds on daily basis.Moreover,newspaper reading(particularly Dawn) on daily basis right from now is a must.Best of luck.