More than half od the persons 25 years old or over in the U.S. had completed at least eight years of school by April 1, 1940, according to final data from the 1940 Census released today by Director J. C. Capt of the Bureau of the Census, Department of Commerce. The proportion who had never completed as much as one year of formal schooling was 3.7 percent, but, at the other extreme, 4.6 percent had finished college.