Hi AnandKumarPandey.
The Official Guide is a pretty limited resource. For Quant, it doesn't have many questions of each sub type, and the questions are categorized into only broad categories. On the other hand, mastering GMAT Quant is best done via doing lots of practice focused on specific topics.
So, for best results from your GMAT Quant prep, you need a resource with many questions, even thousands of questions, categorized by sub type, such as Roots and Exponents, Remainders, Combinations, etc.
Also, you may benefit from learning more fundamental concepts and some effective strategies.
For some tips on how best to master, GMAT Quant, see this post.
How to Increase Your GMAT Quant Score: Top 25 TipsTo learn how to practice for the GMAT for best results, see this one.
The Best GMAT Practice Methods