Dear aspirant,

R.S. Aggarwal's quantitative aptitude book is one of the most popular books for preparation of CHSL.

As you already have a 2009 edition of the book, you can prepare yourself from that only but in this 10-12 years some new types of questions and their solution might have changed.

So to tackle modern questions it is preferable to practice from a new edition book.

You can also prefer these books for the preparation of SSC CHSL-

--> Lucent General Kowledge

--> Objective English by S.P.Bakshi

--> A modern approach to verbal and non-verbal reasoning by R.S Aggarwal

--> Disha SSC CHSL (10+2) Guide, etc.

Hope it helps you..

Best of luck..