Hi, you can refer these books to prepare for SSC GD Constable exam:

General Intelligence and Test of Reasoning - Vikash Publishing House

A Modern Approach to Verbal & Non-Verbal Reasoning - R.S Aggrawal 

General Knowledge 2018 - Manohar Pandey

Objective General English - S.P Bakshi

For further details, you can read the following article: https://competition.careers360.com/articles/ssc-gd-constable-syllabus

Best of Luck