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All of these are good points. Your "bratty kid" post is good and centers on the thesis statement. Your post about the narrator is not really part of the thesis. You have good thoughts, but you need to fix your sentence structure. 85%

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The Cay, by Theodore Taylor is a coming of age book centered around Phillip.

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The Cay, by Theodore Taylor is a coming of age book centered around Phillip.

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At the beginning of the book Phillip is spoiled bratty kid who thinks war is a game.
He also has a prejudice towards black people.

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Phillip is the narrator and the he tells the story makes him the center of the book.Also when Timothy dies the story does not end.

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Later in the story Phillip matures and his prejudice towards black people leaves him. He also learns survival skills on the island.

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When Phillip became blind a lot of things changed. He had to learn to rely on others. He also learns how to survive being blind.

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Later in the story Phillip changes his opinion on black people. After Timothy said "everyone is the same on the inside". After Timothy said that Phillip started to think the same.