Dear aspirant

For SSC CPO you do not have particular maths subject to prepare for. Basically there is quantitative aptitude and reasoning. So I have mentioned below the names for few basic books that you should go through.

General Intelligence and Reasoning Books

• Analytical Reasoning by M K Pandey 
• Verbal and Nonverbal Reasoning by R S Aggarwal 

General Awareness books

• Lucents General Knowledge
•  Manorama Yearbook

Quantitative Aptitude Books

• Fast Track Objective Arithmetic by Rajesh Sharma 
• Quantitative Aptitude by RS Agarwal

Good luck!!