In countries like the United Kingdom and Australia, High Schools have 2 recess' during the day, One at around 10:30 for 20mins to grab a quick bite to eat and recuperate before moving to the next 2-3 classes, and then another recess at around 12:30 for lunch for about 50mins, this has allowed students to be able to focus more, allowing them to focus more on the class rather than how hungry or tired they are. An example of one of these days could be:
2 Classes
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Morning Break
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2 Classes
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Lunch Break
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2 Classes
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The United Kingdom and Australia currently have much better education systems and produce higher results, these breaks could be the solution for America to improve theirs.