Lertlah School is a private school under the auspices of the Office of the Private
Education Commission, Ministry of Education. The Management consists of 4 Chief Executive Directors

1994 was the first year that the School opened and provided an instructional management from Nursery to Primary 3 levels. At that time, there was one building, one meeting room, one swimming pool in the area of three rais (1.2 acres).

1995 There was a second building and the instructional provision was expanded to Primary 4 level.

1996 The instructional provision was expanded to Primary 5 level. In addition, the School launched a value added component to the school in the form of an international program from Kindergarten 1 to Primary 1 levels (K1-P1) taught by qualified and experienced foreign teachers.

1997 The School expanded the instructional management to Primary 6 level. The third building was set up in the area of over 2 rais (about 0.8 acre). This building has 6 storeys. There are a total of 90 classrooms and activity rooms. Each room has a built-in toilet.

1998-1999 The third building was opened for instruction. The School then prepared to be certified on quality standard of education of private schools by the Office of Private Education Commission, Ministry of Education.

2000-2001 An outdoor court and indoor gymnasium were added. The School then was preparing for the International Quality Standard Certification (ISO 9001 : 2000) from the International Organization for Standardization (ISO)

2001 Another Lertlah school was set up at Karnchanapisek Road. The instructional
management of Kindergarten, Primary and Junior Secondary levels were launched in this school. The new school has been preparing for an external evaluation by the Office of Educational Quality Standard Certification.

With cooperation from schools in Canada since the 1996-1997 academic year, Lertlah School has been supported by high level educational institution. In addition, the quality standard of the School has been endorsed by the government sector of Canada as follows:

1. An Associate School Affiliated with Ministry of Manitoba Education, Training and youth, Canada 2. Educational and Academic Exchanges with the University of Manitoba, Canada