When preparing for the SSC CGL (Staff Selection Commission Combined Graduate Level) exam, it's crucial to have the right set of books that cover all the required topics comprehensively. Firstly, ssc cgl books for quantitative aptitude, "Quantitative Aptitude for Competitive Examinations" by R.S. Aggarwal is highly recommended. It covers a wide range of topics from basic arithmetic to advanced mathematics, providing ample practice exercises. Additionally, "Fast Track Objective Arithmetic" by Rajesh Verma is another excellent resource known for its clear explanations and extensive practice questions. For English comprehension and grammar, "Objective General English" by S.P. Bakshi is a popular choice, offering a detailed understanding of grammar rules along with ample exercises for practice.