Hello Rajeev,

Hope you are doing good. For CAT exam preparation there  are a ot of books available which you can refer to for verbal ability section.

Most of the toppers would suggest Arun Sharma and Meenakshi Upadhyay  for All the section of CAT

Apart from that books of Nishit K Sinha and Ajay Singh are also good for verbal ability preparation.

I wish you all the best.