sentences:  In Grengiols about 141 or (28.7%) of the population have completed non-mandatory upper secondary education, and 25 or (5.1%) have completed additional higher education (either university or a "Fachhochschule").Of the 25 who completed tertiary schooling, 80.0% were Swiss men, 8.0% were Swiss women.During the 2010-2011 school year there were a total of 45 students in the Grengiols school system.