It serves grades 6–12 and is an International Baccalaureate continuum school, authorized for Middle Years, Career-related, and Diploma Programmes.

[citation needed] The campus could not support the numbers, and as such Stratford High School was built in close proximity to Westchester, opening in 1974.

In 1987 about 30 students from SBISD and the Houston Independent School District gathered at Westchester High to study Japanese on every Saturday.

It is notable for being the only high school in Spring Branch ISD to offer the International Baccalaureate Diploma program at grades 11 and 12, an authorized Middle Years IB Program for grades 6–10, and has been recently authorized for the IB Career-related Programme.

[4] In Summer 2016, Jennifer Collier stepped down as Director to take the vacant Spring Woods principal position.

Kathy Menotti retired from her original position of assistant director of the Middle School in early 2017.

Currently, the middle school director is Jesse Tachiquin, while the high school director is Alison Butler, while the IB Career Related Programme Coordinator is Sara Sebesta Camano and the IB Diploma Programme Coordinator is Jacquelyn Phillips.

[citation needed] The museum is housed on the north side of the campus and is open to visitors by appointment.

It is one of only 304 schools nationwide to be honored for overall "academic excellence" and for success in closing student achievement gaps.