Hello aspirant,

As there are 4 segments to SSC CHSL-Tier 1, books for the same vary accordingly.

Some of the best books that can help you with your preparation are listed below:

Objective English by SP Bakshi

A modern approach to verbal and non-verbal reasoning Reasoning by RS Aggarwal

Quantum CAT by Sarvesh Kumar Verma

General Awareness by Lucent

However, for all-in-one books please refer to these two:

1) Guide to SSC CHSL by Disha Experts

2) SSC Publication Prime 2.0 by adda247 publications

Both are readily available on e-commerce websites.

For more details, check the link below:

https://competition.careers360.com/articles/best-books-to-prepare-for-ssc-chsl

Hope this information helps.

All the best!