Hello Shane Alam,

CDS is Combined Defence Service Examination Conducted by UPSC.

You can use these books for the preparation of CDS in English-

• Word power made easy-Norman Lewis
• R Gupta CDS Book
• CDS Pathfinder Book

Thank You.

Hope it helps you.

Best of Luck!!!

• Word power made easy vocabulary builder Norman Lewis
• wren's and Martin's high school English grammar and composition S. Chand
• Objective general English S. P Bakshi Arihant publication