Are You There God? Its me, Margaret by Judy Blume.

This is a book I read when I was 12, it was my birthday present from my friend's mom. For girls, we go through puberty when we're 12 (well, on average) and my friend's mom thought that it was a "guide" for me, and the book did help me. Its also about religious intolerance, like against Jewish and etc.

This book is basically about this girl named Margaret who's in sixth grade and has no religion. And throughout the book you can see the process and the problems she faced during her quest for a single religion. She's also confronted by many preteen females issues such as buying her first bra, having her first period and coping with belted sanitary pads, jealousy towards another girl who has developed womanly figure earlier than others, liking boys and voicing opinions if it differs from other girlfriends.

The book is quite simple so that's all I can say about the book or else there won't be any surprise when you read it. :) I recommend young girls to read it like, Year 5-7s. don't really recommend boys it read it, of course.