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Academics

Entrance Exam

  • St. ThomasISEE (School code 571055; freshmen. Transfers: ISEE or PSAT.)
  • St. AgnesISEE (School code 443420; up to 2 scores; first attempt before Dec 1 (ERB rule))
  • St. Catherine'sNone (No admission test. Inquiry → adults-only tour → director meeting → application ($150) + records + lesson samples → student classroom visit. 9th graders enter the Adolescent Community (gr 7-9); High School entry is gr 10-12.)
  • DuchesneISEE (Administered externally; campus tour + family interview also required)

AP Courses

  • St. Thomas21 (40+ advanced/AP courses overall)
  • St. Agnes25
  • St. Catherine'sNot Published
  • Duchesne20 (AP enrollment caps: soph 1 / jr 2 / sr 3; AP exam required if enrolled)

Recommendations

  • St. ThomasMath + English teachers (HAIS forms, after Dec 1); student statement + resume; report cards gr 6-8
  • St. AgnesEnglish + Math teachers (due Jan 14, 2027)
  • St. Catherine'sNot Published
  • DuchesneEnglish and/or Math teacher + principal/head of school; 2 years transcripts

World Languages

  • St. ThomasFrench · Spanish · Mandarin · Latin
  • St. AgnesNot Published
  • St. Catherine'sSpanish · Latin/French/ASL/Portuguese via independent study & university partnerships
  • DuchesneFrench (incl. Advanced IV-DELF B1) · Spanish (incl. AP) · American Sign Language I-III

Dual Credit

  • St. ThomasYes (4 dual-credit courses via University of St. Thomas)
  • St. AgnesNot Published
  • St. Catherine'sNot Published
  • DuchesneYes (University of St. Thomas partnership; online electives via SophieConnect + One Schoolhouse)

Honors Courses

  • St. ThomasNot Published
  • St. Agnes12
  • St. Catherine'sNot Published
  • Duchesne12 (Called "Advanced" courses)

Academic Model

  • St. ThomasNot Published
  • St. AgnesNot Published
  • St. Catherine'sAMI-accredited Catholic Montessori adolescent program — four integrated areas (Theology, Integrated Humanities, Integrated Sciences, Mathematics); internships (Houston Methodist, law/design firms), university partnerships (St. Thomas, Texas A&M AgriLife), independent study; graduates build a "body of work" (No AP program; university partnerships and internships serve the advanced-work role.)
  • DuchesneNot Published

AP Exams Scored 3+

  • St. ThomasNot Published
  • St. Agnes97 (% of AP exams scored 3+)
  • St. Catherine'sNot Published
  • DuchesneNot Published

Application Deadline

  • St. Thomas2027-01-15 (Opens Aug 3, 2026; supporting docs due Jan 31; rolling after)
  • St. AgnesNot Published
  • St. Catherine'sNot Published
  • DuchesneNot Published

Language Credits Required

  • St. ThomasNot Published
  • St. Agnes2
  • St. Catherine'sNot Published
  • DuchesneNot Published

Learning Support

  • St. ThomasLearning Enrichment Center; college counseling with 4-year plan
  • St. AgnesNot Published
  • St. Catherine'sNot Published
  • DuchesneNot Published

Notable Programs

  • St. ThomasNot Published
  • St. AgnesNot Published
  • St. Catherine'sNot Published
  • DuchesneRobotics and competitive debate programs; IT internship with Microsoft certification; junior Research Paper requirement

Robotics

  • St. ThomasNot Published
  • St. AgnesSpectrum 3847 — 12 consecutive FIRST Championship appearances
  • St. Catherine'sNot Published
  • DuchesneNot Published

Test Score Deadline

  • St. ThomasNot Published
  • St. Agnes2027-02-01
  • St. Catherine'sNot Published
  • DuchesneNot Published
Commute from home
Tuition
$27,900

2026-27 rate

$28,400

2026-27 rate

$20,560

2026-27 rate · 9th grade; grades 10-12: $20,753

$33,600

2026-27 rate · Upper School

What's included
Included in tuition see list
  • Laptop & technology

Charged separately:

  • Application fee: $75
  • Registration fee: $700
  • Camp Aquinas (freshman retreat): $650 (freshmen)
  • Class retreat: $325 (returning/transfer students)
  • Books: $550
  • Athletics fee: $250 (per sport) — optional
  • AP exam: $99 (per course) — optional
Fees listed separately see fees
  • Application fee: $75 ($125 for transfer applicants)
  • Enrollment deposit: $500
  • Tablet PC (technology): $1,725
  • AP test fee: $105 (per AP / Honors-AP class) — optional
  • Senior fee: $350 (seniors only) — optional
  • Athletics fee: $150 (per sport) — optional
Fees listed separately see fees
  • Application fee: $150
  • Tuition deposit: $750
  • New Student Fee: $850
  • Facility fee: $800
  • Program fee: $2,500–$2,750
Fees listed separately see fees
  • New Student Fee: $1,500
  • Enrollment deposit: $1,000
  • Technology fee (Grade 9): $2,600
  • Textbooks: $350 (approximate, Upper School)
  • Grade 10 College Tour: $500 (grade 10)
  • Graduation fee: $600 (seniors)
  • Class trips: $175–$2,800 — optional
  • AP exams: $100–$200 (per exam) — optional
  • Athletics fee: $150–$300 (per sport) — optional
Sibling discount$2,000/yr per sibling after the firstNot Published10% off for each younger siblingNot Published
Lower school on campusHS onlyHS only
Yes

14 months–12th (Montessori)

Yes

PK3–12

Open houseDec 6, 2026Not postedNot postedNov 1, 2026
Required test
ISEE

Offered on campus: Nov 14, 2026 · Jan 9, 2027

ISEE

Offered on campus: Nov 14, 2026

None
ISEE
Application deadlineJan 15, 2027Not postedJan 15, 2027Not posted
Decision dateMar 5, 2027Not postedMar 5, 2027Not posted
Financial aid
Need-based + Merit
Need-based

No merit scholarships

Need-based
Need-based + Merit
AP courses2125Not posted20
Enrollment79193423300
Student:Teacher9:19:114.4:18.1:1
Mass
Monthly
Weekly

Thursdays, 9:10 AM

Monthly
Not Published
Sports12 sports12 sports6 sports12 sports
Links

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