How To Write A Book Review

A review describes, analyzes and evaluates the book. It’s like you're talking to someone who's asking you whether they should read the book.
Here’s the do’s and don’ts of a Review.
Start with a couple of sentences describing what the book is about
A short synopsis of the book in your words gives an overview of the storyline. However, make sure that you do not reveal crucial elements from the storyline, especially the climax. If the book is part of a series, always mention that fact. 
Discuss what you particularly liked about the book
Keep monitoring your thoughts and feelings towards the story as you read it. It will help you in understanding what you feel about the book. While translating your thoughts into a review, do answer the following questions:
Did the characters feel real to you, or were they in sync with the plot of the story?
Was the pace of the story appropriate with the plot? 
Comment on the writing style of the author.
Was the book properly edited and formatted?
Was the book’s cover appealing?
Mention anything you disliked about the book
No book is ever perfect and as a reviewer, you should be open about what you disliked about a book. While commenting on what you did not like, refrain from an aggressive, abusive and obscene language. No personal comments on the author should be made. Address the following questions in your review:
Did you fail to connect with the characters in the book? If so, why?
Was the book poorly edited or formatted?
Did the book lack flow and did it become difficult to connect all the chapters together?
Was the storyline unrealistic? Do consider the book’s genre while answering this question. Fantasy and Science Fiction always have unrealistic elements. In that case, did they fit well in the story?
Round up your review 
Give an overall recommendation about the book. Will you recommend the book to others? If yes, then what type of readers will they book attract….their age, gender, genre preference? 
Rate the book out of 5