ACT test score and subscores

<p>For Math, English, and Reading, there are subscores. Reading score is 36, and its social studies/science subscore is 18, and its art/language subscore is 18. My D got 17 for social studies/science, and 16 for art/language, and the addition of these two subscores is 33. But, my D's reading score is 32. I don't doubt ACT's computing system, so my guess is 17 = 16.5, and 16=15.5, which makes a sum of 32. For Math and English, her section score was the same as the sum of its subscores, but Reading had a smaller section score than the sum of its subscores. Is there anyone who knows about this? Thanks.</p>

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<p>From Kajon’s link: “There is no direct, arithmetic relationship between your subscores and your test scores—this means your subscores don’t add up to your test score.”</p>