International School Of America

The International School Of America (ISA) is a small, high-performing high school in San Antonio, TX, serving 493 students in grades 9-12 and consistently ranking in the top 10% of all Texas high schools. Part of the North East Independent School District (Isd), ISA stands out dramatically from its peers, earning a 5-star rating from SchoolDigger with a near-perfect 99.2% graduation rate and an exceptionally low 0.2% dropout rate. This performance far exceeds nearby schools like Churchill High School, which has an 86.9% graduation rate, and even outpaces the highly-regarded Alamo Heights High School (94.8% graduation rate).

Academically, ISA students achieve remarkable proficiency in most core subjects, with English I and II reading scores around 85% and Biology at nearly 89%—roughly 30 percentage points higher than the district average. However, the school has a notable and persistent weakness in Algebra I, where proficiency has dropped to just 33%, significantly below the district average of 60%. This "Algebra I anomaly" is a critical area for parents to investigate, as it contrasts sharply with the school's stellar performance in every other tested subject. ISA also achieves these top-tier results with lower per-student spending ($7,038) compared to nearby schools like Legacy Of Educational Excellence High School ($9,817), though a recent jump in the student-teacher ratio to 21.4:1 is a trend worth monitoring.

Interestingly, ISA shares its address with Legacy Of Educational Excellence High School, a much larger school with a 2-star rating and an 80.8% graduation rate, highlighting the power of school choice within the same building. ISA is a clear outlier in its district, performing more like an elite 5-star district such as Alamo Heights Independent School District (Isd) than its own. For families seeking a college-preparatory environment with exceptional outcomes, ISA is a standout option, though the Algebra I challenge and changing class sizes deserve close attention.