How to prepare for mathematics.. please give some idea ..

Hello Sushant, We are coming up with CSAT sample papers soon.Hope that will help you. Meanwhile you can refer NCERT Maths from class 6 to 10th. Some other good books are RS Agarwal CAT books by Arun Sharma Pearson CSAT manual Trishna’s Quantitative Aptitude And Data Interpretation CSAT (paper II) by Cl India CSAT Conceptual Approach (Paper – 2) by P. N. Roy Chowdhury UPSC Portal: CSAT Comprehensive Manual. You can also refer to past papers