1938 – The barrio school was opened with one teacher teaching grades one and two. The first teacher was Mr. Julio Clemente, a teacher of Santa Ignacia even to the present (1953).

            1941-1945 – During the Japanese occupation the people did not leave their homes. The barrio is 18 kilometers from the town and they were not bothered by major military operations. However, the barrio was the hide out of Filipino resistant leaders and soldiers and for several times the Japanese forces accompanied by Filipino spies came to raid the barrio. The guerrillas ask for food. The Japanese punished the people for doing so. One night in 1944, the guerrillas snatched the teniente, Felix Sotero from His house and brought him faraway. Luckily they released him the following day and he returned home. Hundreds of guerrillas came to the barrio and many Japanese patrols also came to look for the guerrillas. The people experienced dancing with two opposing forces. The period is considered the darkest period in the history of San Sotero.

            1945, February – the school building (semi-permanent) was burned because it was the hiding place of many Japanese strugglers. In 1945 the people also evacuated their houses and went to the town and other barrios. In 1947, the people return to San Sotero and started working their farm.

            1948 – the school building was reconstructed by United States through the Philippine War Damage Act.

1952, September 20 – the school building was demolished through a resolution. The building was transferred to San Francisco.

            The people of the barangay wanted their children to be educated so they decided to request the authorities in the municipality and the ministry of education to put up a school in the locality. Their request was granted and the first school was established in the 1950’s. A combination class of Grade I and II was then created. The first teachers encounter difficulties in going to school since the road is very muddy so they have to walk 15 kilometers from San Sotero to the town proper. Vehicles were also not available. Teachers were very compassionate, committed and dedicated and were able to deliver their task to the school children.

            Later in 1970’s, the place was given Grades II and IV classes. Two teachers were deployed to handle the class.

            After completing primary grades, pupils are forced to go to the nearby school which is about 3 – 5 kilometers away just to finish their elementary schooling.

            In the year 2011, the parents, the barangay officials and Mrs. Marcelina B. Bautista, the current principal of the school and the teachers namely Elmer Medina, Randy Domingo and Menchie I. Jose made a request and resolution to the District Supervisor, Mrs. Serlita B. Agustin, to make San Sotero Primary School to be a complete elementary school so that the school children will no longer walk to the nearby school and so that elementary  is more accessible in the barangay. The request was granted therefore they have their first graduation on March 2012 with 12 graduates, 6 boys and 6 girls under the advisorship of Mr. Rogelio Villanueva.

            At 2013, San Sotero Elementary School has remarkable increase in enrolment. It has three (3) nationally funded teachers namely: Menandro I. Domingo, Rubilyn E. Sumaoang and Beverlie Anne F. Morido. It has also one (1) LSB-SEF funded teacher and a Kindergarten teacher: Gloria E. Tablante and Maria Clarice DV. Salvador.