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Academics

Entrance Exam

  • St. ThomasISEE (School code 571055; freshmen. Transfers: ISEE or PSAT.)
  • 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)
  • St. AgnesISEE (School code 443420; up to 2 scores; first attempt before Dec 1 (ERB rule))

AP Courses

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

Recommendations

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

World Languages

  • St. ThomasFrench · Spanish · Mandarin · Latin
  • 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
  • St. AgnesNot Published

Dual Credit

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

Honors Courses

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

Academic Model

  • St. ThomasNot 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
  • St. AgnesNot Published

AP Exams Scored 3+

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

Application Deadline

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

Language Credits Required

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

Learning Support

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

Notable Programs

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

Robotics

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

Test Score Deadline

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

2026-27 rate

$20,560

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

$33,600

2026-27 rate · Upper School

$28,400

2026-27 rate

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: $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
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
Sibling discount$2,000/yr per sibling after the first10% off for each younger siblingNot PublishedNot Published
Lower school on campusHS only
Yes

14 months–12th (Montessori)

Yes

PK3–12

HS only
Open houseDec 6, 2026Not postedNov 1, 2026Not posted
Required test
ISEE

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

None
ISEE
ISEE

Offered on campus: Nov 14, 2026

Application deadlineJan 15, 2027Jan 15, 2027Not postedNot posted
Decision dateMar 5, 2027Mar 5, 2027Not postedNot posted
Financial aid
Need-based + Merit
Need-based
Need-based + Merit
Need-based

No merit scholarships

AP courses21Not posted2025
Enrollment79123300934
Student:Teacher9:114.4:18.1:19:1
Mass
Monthly
Monthly
Not Published
Weekly

Thursdays, 9:10 AM

Sports12 sports6 sports12 sports12 sports
Links

“Not posted” means the school hasn’t published it yet for this admissions cycle — check each school’s full profile for sources.