Best book/study material for Essay paper in IAS mains exam?

Best book/study material for Essay paper in IAS mains exam?
thank you.

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Civil Service Examination Books ::

1. Objective General Studies For UPSC Civil Services Preliminary Examination
by A. R. Khan
Publisher: Tata Mcgraw Hill Education Private Limited
Price: Rs. 180

Basic Numeracy
by Upscportal
Publisher: UPSC Portal
Price: Rs. 240

UPSC Portal: General Mental Ability Logical Reasoning & Analytical Ability
by Sachchida Nand Jha
Publisher: UPSC Portal Publications
Price: Rs. 230

IAS PRE: Data Interpretation and Data Sufficiency
by Upscportal
Publisher: Upscportal.com
Price: Rs. 225

UPSC IAS PRE: English Grammar and Usage
by Upscportal
Publisher: UPSCPORTAL Publications
Price: Rs. 220

UPSC PORTAL: English Language Comprehension Skills
by UPSCportal Editorial Board
Publisher: Upsc Portal
Price: Rs. 150

UPSC Portal General Knowledge Manual
by UPSCportal Editorial Board
Publisher: Upscportal.com
Price: Rs. 150

Indian Polity for Civil Services Examinations
by M. Laxmikanth
Publisher: Tata Mcgraw Hill Education Private Limited
Price: Rs. 410

Modern Indian History
by Tarique Mohammad
Publisher: Tata Mcgraw Hill Education Private Limited
Price: Rs. 250