As you requires I am here suggest you good books to purchase for Preparation of SSC Combined Graduate Level Exam.

SSC CGL books :

SSC General Awareness - Chapterwise Solved Papers 1997 totill Date (8425+Objective Question) by Kiran Prakashan (English)

SSC Reasoning - Chapterwise Solved Papers 1997 to till Date 6200 + Objective Question by Kiran (English)

Arihant GeneralKnowledge 2016 (English

Tata MacgrawHill General Studies Manual (English)

Lucent'sGeneral Knowledge (English)

Indian Polity - M. Laxmikanth

Brief History of Modern India- Spectrum

Indian Economy - Ramesh Singh

Verbal and Non Verbal Reasoing by R. S. Aggarwal

AnalyticalReasoning by M. K. Pandey

Competitive Reasoning Verbal and Non Verbal Fully Solved: Question Logical Reasoning and Analytical Ability by Kiran Publication

Fast Track Objective Arithmetic by Arihan

Magical Book On Quicker Maths by M.Tyra

Data Interpretation Data Sufficiency by Arihant

An Advanced Approach to DataInterpretation by R.S. Aggarwal

Objective General English by SP Bakshi (Arihant)

Objective English for Competitive Exams by Tata McGraw Hill

Howto Prepare for Verbal Ability and Reading Comprehension for CAT (English) by Arun Sharma(Tata McGraw Hill)