St. Mark’s School of Texas (Dallas) – Rigorous academics, grade A+
$32,537.00 – $41,554.00Price range: $32,537.00 through $41,554.00

Academics & Test Scores
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Grade: A+ (Niche overall rating)—with top marks in Academics, Teachers, College Prep, and Clubs & Activities
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Average SAT score: approximately 1500 (mid‑50%: RW 695–770, Math 710–800). That’s reaffirmed by both the school and independent sources
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Average ACT composite score: around 33–34; middle 50% between 34–35
Academic Excellence & Honors
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National Merit Recognition: About 56% of the Class of 2025 received National Merit honors (semifinalist or commended), and five seniors in the past five years have been named U.S. Presidential Scholars.
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AP Courses and Outcomes: The school offers 22–25 AP courses. In 2024–25, over 730 AP exams were taken, with 99% scoring 3 or higher
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Competitive Achievements: St. Mark’s Quiz Bowl and STEM teams have earned national titles; the middle school WordMasters vocabulary challenge team has consistently placed first nationally—and other teams have ranked in national scholastic competitions.
Reputation & Rankings
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Niche rankings 2025:
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#1 in Texas for College Prep Private High Schools
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#2 in Texas for Private High Schools overall
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#1 for Best All‑Boys High School in the U.S.
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#24 for STEM in America and #1 in Dallas–Fort Worth.
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Stanford’s former admissions dean once cited St. Mark’s as “among the top handful of schools in the country”.
Size & Faculty
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Enrollment: about 900–920 boys from grades 1–12, with ~428 in upper school and an ~8–9:1 student-to-teacher ratio.
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Faculty Credentials: Over 60% of full‑time teachers hold master’s or doctoral degrees, and the average faculty member has 22 years of teaching experience.
Admissions & Financials
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Tuition: around $35.7k–35.8k/year; slightly varying by grade.
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Selectivity: Acceptance rate about 15%; yield of admitted students around 89% with 99% retention.
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Financial Aid: About 14–15% of students receive aid; families earning under ~$140k may get up to 90% tuition support; annual aid exceeds $3–4 million
Culture & Student Life
St. Mark’s delivers more than academics. It’s known for an immersive experience—strong traditions, character development, robust extracurricular programs including athletics (85% participation upper school), fine arts, travel, and a broad student‑run club ecosystem (~90 clubs).
According to Niche reviews, students and parents consistently praise the school’s rigor, supportive faculty, and opportunities—while noting areas like mental‑health support and broader electives could be expanded.
Bottom Line
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Yes—St. Mark’s School of Texas boasts Grade A+ academics, a stellar average SAT around 1500, and highly selective admission.
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The school’s rigorous curriculum, strong faculty, and extensive extracurricular achievements make it one of the most competitive private all-boys schools in the U.S.
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If you’re evaluating schools primarily on academic outcomes, college readiness, prestige, and character-building experiences, St. Mark’s consistently ranks among the elite.
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