In the early seventies, the growing number of people in the GSIS La Mesa Homeowners Association (GLAMEHA) triggered the need for a high school in Lagro Subdivision. The officers of GLAMEHA requested fervently for an establishment of a high school next to Lagro Elementary School. With the aid of the city government and the education bureau, Novaliches High School with Mr. Florencio Dumlao as principal started accepting students. This high school annex started on June 13, 1974 with 87 students and a facility, which were humbly two housing units in Block 59 and chairs the students provided themselves. On August 26 of the same year, Lagro Annex was transferred to the Lagro Elementary School compound and occupied the sawali-walled makeshift building. The high school was then headed by Mr. Crispulo A. Pilar with Mr. Narciso M. Caingat, Mrs. Nilfa C. Caingat and Mrs. Greta Manlapig as pioneer teachers. Two years after, the enrolment rose to 249 from the former 87 with three sections in first year, two in second year, and one in third year. They were all managed to stay in just four classrooms guided by nine teachers. The first graduation from this high school happened two years after with an increased enrolment of 461 with Mrs. Josefa Q. Maglipon, head of the Home Economics Department in Novaliches High School, who replaced Mr. Pilar(who left for the United States). The School Year 1977-1978 reached 774 with 15 sections occupying seven classrooms. With this problem on accommodation, Mr. Florencio Dumlao appealed to the national government for a Lagro Annex Building. Through the unrelenting efforts of the department head-in-charge and with the PTA lobbying behind, the 1.3 hectare present school site, and building became a reality. At the opening of classes on June 11, 1978, 923 students flocked the newly constructed building which was a two-story 18-room structure standing proudly with Mrs. Maglipon as head of the school. She was replaced with Mr. Silverio Reinoso. Mr. Reinoso had to continue with the challenge to manage 19 sections of students with just 32 teachers. It was the significant day of September 1, 1978 that Lagro High School was inaugurated by Mrs. Commemoracion M. Concepcion, the former schools division superintendent. Thus, it has become its foundation day. Hand in hand with the influx of residents in Lagro Subdivision is the continuous increase of student population. And to accommodate this increasing population, a six-room building on the southern site of the campus was constructed. The school then also improved with the completion of concrete fences surrounding the campus, construction of the stage and the new steel flagpole, all to house and educate the community. Mr. Reinoso was replaced by Mrs. Virginia H. Cerrudo on September of 1981. Mrs. Cerrudo was replaced with Ms. Felicidad C. Gutierrez in 1987 bringing another building funded by the city government. The same year created the Lagro High School-Payatas Annex with 257 students. This annex was assigned to Mrs. Sheridan Evangelista, who was then the Social Studies Department Head of the Main School. Promoted as Principal IV, Ms. Gutierres was transferred to E. Rodriguez Jr. High School. Mr. William S. Barcena took her place as the principal of Lagro High School on June 1991. Three years after, Mr. Barcena was replaced by Mrs. Cristina C. Monis, the General Education Supervisor I-English, as Officer-In-Charge on January 8, 1993. Mr. Gil T. Magbanua replaced Mrs. Monis on June 13, 1993 To accommodate the continuous increasing enrollees, the three-story building funded by the Quezon City Government was constructed. The third Annex in Fairview was finally opened with Mrs. Justina A. Farolan as the Teacher-In-Charge. Dr. Consolacion C. Montano replaced Dr. Gil Magbanua later on with more improvements. Mrs. Sheridan Evangelista made her...