Strategies to tackle Quants section?

You should go with Arun Sharma Book for Quantitative aptitude where there is Lucid understanding, make sure you give atleast 5 sectional mocks for quants. Focus on weak areas, negative scoring questions and time consumed for the same as well as unattempted questions. Revise your basic cincepts and give more and more mocks plus go through previous year question papers. Please check below link for reference. https://www.google.co.in/amp/s/bschool.careers360.com/articles/cat-must-read-books-for-preparation%3famp

Arun Sharmas book on Quantitative Aptitude is a very good source for CAT/XAT /Any other MBA entrance preparation.
You can start from the basics by solving simple questions then gradually moving to the difficult ones. You can take up a new topic every day & also try to solve the same question in different ways.

To score high, you need to find out why are you scoring less.  It can be,

• Less attempts
• Less accuracy
• Less time to solve questions

or maybe some other reason.
This section is all about practicing, less use of calculators, more of mental calculations, make your own approaches to solve the sums and more of practice.

All the best!