With school back in session, school ranking website Niche released the 2025 edition of its annual Best San Antonio High Schools list — and there are a few surprises. TMI Episcopal — the school where all the kids from the Dominion go — took home the title as the area’s best high school, earning an overall grade of A+ from Niche. Niche complies with its rankings by analyzing academic grades, state assessment proficiency, standardized test scores and survey responses from parents and students.