What's the Name of That Book??? discussion

This topic is about
Ordinary Magic
SOLVED: Children's/YA
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SOLVED. YA Fantasy. Girl has a large family and is in a society that has different levels of magic. She’s tested on her (12th?) birthday and turns out to be a level zero (out of 11?). Read around 2014. Spoiler below. [s]
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I believe monsters attacked the school at the end and kidnapped a few students. They want to find their friends and it leaves on a bit of a cliffhanger.