Summary:
In zip code 78645, there is one high school, Lago Vista High School, which serves grades 9 through 12 in the Lago Vista area and is part of the Lago Vista Independent School District (Isd).
Lago Vista High School has a total enrollment of 650 students and a favorable student-teacher ratio of 13.4:1, suggesting smaller class sizes. The school maintains a strong graduation rate of 94.7% and a low dropout rate of 1.0%. However, its state ranking has declined significantly over the past three years, dropping from the 71st percentile (4 stars) in the 2023-2024 school year to the 52nd percentile (3 stars) in the 2025-2026 school year, a fall of 371 places. This decline is notable given the school's high graduation rate, indicating that while students are staying in school, academic performance on standardized tests is not keeping pace with other Texas schools.
The most striking finding is a severe performance gap in math. In the 2025-2026 school year, only 18.31% of students were proficient in Algebra I, compared to the state average of 54.03%, a massive 35.7 percentage point deficit. This is a systemic issue, as the previous year also showed a low proficiency rate of 20.19%. In contrast, the school excels in humanities, outperforming state averages in English I Reading (61.08% vs. 55.43%), English II Reading (60.96% vs. 59.88%), and U.S. History (73.72% vs. 70.17%). Biology proficiency is slightly below the state average at 69.19% versus 70.51%. This "split personality" suggests the school's strengths lie in reading and social studies, while math and science departments may need significant intervention. Additionally, the district's Algebra I proficiency rate (35.36%) is much higher than the school's rate (18.31%), hinting that the issue may be concentrated at the high school level.
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