Actually in examination one part of paper is comparatively easy than other, it can be either Maths or Statistics. Easy means no logical question only u have to put formulas. So prepare both the parts, atleast basic knowledge of all the chapters must be with you. No need to solve very difficult question and also its enough if you use Study material only. Don't time waste in scanners and other books, and don't worry if you would not be able to cover all chapters, utilize ur time on other subjects like Law, Economics, its a scoring subjects.
Two Mantras for Success : Sincerity and Dedication
"If u have a this two things then Hardworking and Time management comes automatically."
Best of Luck, Start preparing with beginning and CHAK DE..............