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I read this book about ten years ago, I unfortunately don't remember much about the general plot but I do remember some odd specific details. Firstly, although it was definitely a stand-alone book, I read it in a collection titled something along the lines of "Exciting Stories for Boys". I think the first Guardians of Ga'Hoole book was included in this collection but I might be wrong.
The book itself was a YA story about a high school boy who lived on earth shortly before it got struck by a meteor; a lot of the book was him going about normal high school business, but at some point he learns that the world is going to end and only a certain number of important people and their families got to board a ship to another planet (his dad was a VIP for some reason I think). I remember that when he boards, there was a child on the ship who wanted to bring a teddy bear, but wasn't allowed to because they didn't have room. Eventually, they put some tubes in the protagonist to put him in some sort of cryo, and then the book ends giving us a depressing description of most of the characters we met during the book dying to a meteor impact (including the main character's crush who we saw a lot of).
I know this isn't a lot to go off of, but I believe the book was relatively popular and had some sequels (though I didn't read any).