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Update `grade-school` tests #1184

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Run time

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Job	Run time
Linux Min Config (clang++-6.0)	1m 25s
Linux Min Config (g++-10)	1m 26s
Windows	3m 17s
Linux Latest Config (clang++)	5m 42s
MacOS	1m 37s
Linux Latest Config (g++)	1m 16s
	14m 43s