[citation needed] Leigh is an academically successful high school, with rankings placing it above average when compared to others in California.

[citation needed] Leigh's 1,600+ students annually score above the state and national averages on the STAR, CAHSEE, SAT, and Advanced Placement tests.

[citation needed] Leigh offers Advanced Placement (AP) instruction in Chemistry, Biology, Physics, English Language, English Literature, Psychology, Macroeconomics, World History, US History, American Government, Studio Art, Spanish Language, French Language, Mandarin (added on-campus 2015), Calculus AB, Calculus BC, Statistics, Computer Science (added in 2015), and Music Theory.

Silicon Valley Career Technical Education offers interested students a variety of vocational training in areas such as multimedia, cosmetology, managerial accounting, electrical maintenance, and auto body repair.

[citation needed] All high school students in the county's Deaf and Hard of Hearing program attend classes at Leigh.

In the winter of 2012, the Leigh High School Marching Band traveled to San Diego to perform in the Bridgepoint Education Holiday Bowl.

[citation needed] Symphonic band is a performance-based ensemble for students who have prior experience on their instrument and the ability to read music.

[citation needed] In 2013, under the direction of new Caption Head Daniel Recoder, the ensemble started competing in the Percussion Scholastic Open class.

In 2018, the ensemble returned once more to Dayton, OH for the WGI Percussion World Championships where they finished, this time in 11th place out of 125 groups.

In 1970 the varsity football team again won the league title with a record of 11–1, its lone loss coming in the inaugural County Championship game against Los Altos Hills (30–23).

Leigh also won back-to-back Mount Hamilton division league championship titles in 1994 and 1995, losing one regular season game and having one tie in that span.

In the mid-1970s, Leigh High was noted for its cross country dynasty under the coaching of Homer Latimer, and in 1974 the Longhorns won the national title.

The school's proximity to the foothills of the Santa Cruz Mountains, where runners trained vigorously year-round, was a significant contributor to the program's success.

A subgroup of this organization is Leigh's Student Congress, for which diverse representatives are chosen from each sixth period class.

[citation needed] Leigh is currently in the final stages of its building renovations, which were initiated by a ninety-five million dollar local school bond measure passed in 1999.