I purchased this book 1 year ago for the preparation of various competitive examination like RRB, BANK, SSC etc.
But was vary disappointed by reading it for 1-2 month's.
No questions were asked from this book.
One of the major disadvantage of the book is that it is not available in English language.
It's terrible to read hindi language in that font in Hindi language and equally difficult to understand that.
Now a days children's learn everything in English language so it's difficult to understand for them.
For example: -if children's learning name of planets im English language they can't understand there Hindi name and in most of the papers the hindi language is not asked so it becomes terribly difficult to understand.
Also to remember it its quite difficult.
Readability is quite good.
But have to work with fonts and it will be even better if English version is introduced in market .
Price is ok.
My recommendation would be to wait until English version arrives