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Getting Census data of Lyman School kids & workers
Heritage Quest Census pages are on line & can be accessed free via many state & local library web links.
The 1920 listings are on T625, Roll 749, Pgs end at 184?(there are 10 pages)
 

From Westborough Census for Lyman School in 1920 , Massachusetts ED 184
There were10 pages, so assume its 25/page=250 or so people, children & workers there.
Assistant Superintendant was:  Walter Megis as listed in 1920 census for school & shown below