I'm hoping you want me to really be honest. If you don't, then don't read.
No reviews wouldn't put me off getting it, if it sounded like it was the sort of book my dc would have liked. But there are several things here that would mean it never got anywhere near my basket.
Firstly, the title:
I know why you've called it "eleven" having looked at it, but it doesn't tell me anything about the book; it's not going to come up in google by accident either and intrigue me.
So it's not going to have a hook that makes me think "oh, that sounds interesting." Not an issue if it sounds great when going further in, but there's a high chance I'd never click on it even if it was brilliant.
The cover:
I don't know if you drew it yourself, and it's a good drawing, but it looks rather young to me. It reminds me of those everlasting princess school books that my girls loved about age 5-7yo along with the Rainbow Fairies. Look at modern covers for similar books.
This is aimed at a similar age (although the cover is 10 years old)
Are You There, God? It's Me, Margaret: Now a major film starring Rachel McAdams and Abby Ryder Fortson eBook : Blume, Judy: Amazon.co.uk: Kindle Store
The Blurb:
You've made several grammar issues/typos in the blurb, which would immediately put me off. (eg "Afterall" isn't one word) Fussy maybe? But you don't want to put a potential buyer off for any reason. Get it proofread, and proofread again.
You've also made the book sound worthy/preachy and boring, because you've presented it as "I know how to solve all your dc's issues at starting secondary school."
Aim the blurb at the child not the parent; or if you want to aim it at the parent then give your credentials - did you write it after your child had had difficulties, or are you a teacher etc?
I'd look at that blurb and think that the book will go along the lines of:
"Issue: Worries about starting school has chat to mum. Mum/other grown up gives answer and she does what mum says and all is solved. Next issue arises, repeat."
Make it sound a rollercoaster of a book: start with a bang and work towards an explosion before the satisfactory conclusion.
She's worried about starting school (leave the youngest in the year behind, or you're potentially excluding 6 months of children too who immediately say they can't identify with that) and she's trying to focus on having fun with her friends, but these niggles are coming up in her mind and she can't get rid of them. But she's a bit excited too, she's heard that the school does XYZ and she can't wait to try them...
The sample:
Proofread it! And the rest of the book. I'd also take off hyphenation for a book aimed at that age.
The chapters you've put out don't pull you into the story. You're jumping around from event to event, so you don't really get a feel of what she's like and start rooting for her. She's describing others but I get no feel for her, other than the fact she lacks confidence, which I get by the end of the first page.
eg Chapter 2 is meant to be about her smartphone, but a good bit is about her cat, and a page is on her brother and his Nintendo.
You need to have something that makes the reader connect with her, and want to know that she's okay, to keep them reading. By the end of the first chapter there needs to be something that needs to be resolved. Maybe one of the best friends makes a comment that worries her eg they have a new neighbour whose daughter is going to be in their form and she likes her, or another pair of girls also having dinner sneer at the fact they get her parents to order and call them babyish- and then they turn out to be also going to the same school. Something that will up the ante.
You also need to have something different about your book to persuade them to pick yours rather than another.
You write very much as you speak, so it might work better as a diary rather than prose, and you could then go far more into her worries as she confides in her diary, but have her bravely trying to work through them - the reader knows how agonising she finds it going into school the day after she'd had that row, but she is able to hide it from her friends, who whisper afterwards "I can't believe you came in today, I'd have been too scared..."
And when you have a physical book, then try going round the local schools/libraries and offering to come and talk to the year 6s, offer the school a free book etc.
There's so much on Amazon, that there's a high chance that no one who is looking for a book like yours will ever find it, so you have to go and hunt for the buyers.