PYP or British/American curriculum

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I have a son in a PYP school (grade 4) but I'm starting to get worried about his academics. His teacher told us recently that he needs help with his math. But when we asked his teacher excatly what they were studying or what we needed to do to help him she couldn't give us the details. She kept talking about helping him understand concepts and PYP outcomes. Have other parents experienced something similar? We are wondering if we should put him a more academically stronger school? Are there PYP schools that teach math, language and science well?

Thanks