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Academics

Entrance Exam

  • St. AgnesISEE (School code 443420; up to 2 scores; first attempt before Dec 1 (ERB rule))
  • St. ThomasISEE (School code 571055; freshmen. Transfers: ISEE or PSAT.)
  • DuchesneISEE (Administered externally; campus tour + family interview also required)
  • 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.)

AP Courses

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

Recommendations

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

World Languages

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

Dual Credit

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

Honors Courses

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

Academic Model

  • St. AgnesNot Published
  • St. ThomasNot Published
  • DuchesneNot 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.)

AP Exams Scored 3+

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

Application Deadline

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

Language Credits Required

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

Learning Support

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

Notable Programs

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

Robotics

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

Test Score Deadline

  • St. Agnes2027-02-01
  • St. ThomasNot Published
  • DuchesneNot Published
  • St. Catherine'sNot Published
Commute from home
Tuition
$28,400

2026-27 rate

$27,900

2026-27 rate

$33,600

2026-27 rate · Upper School

$20,560

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

What's included
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
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
  • 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: $150
  • Tuition deposit: $750
  • New Student Fee: $850
  • Facility fee: $800
  • Program fee: $2,500–$2,750
Sibling discountNot Published$2,000/yr per sibling after the firstNot Published10% off for each younger sibling
Lower school on campusHS onlyHS only
Yes

PK3–12

Yes

14 months–12th (Montessori)

Open houseNot postedDec 6, 2026Nov 1, 2026Not posted
Required test
ISEE

Offered on campus: Nov 14, 2026

ISEE

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

ISEE
None
Application deadlineNot postedJan 15, 2027Not postedJan 15, 2027
Decision dateNot postedMar 5, 2027Not postedMar 5, 2027
Financial aid
Need-based

No merit scholarships

Need-based + Merit
Need-based + Merit
Need-based
AP courses252120Not posted
Enrollment93479130023
Student:Teacher9:19:18.1:114.4:1
Mass
Weekly

Thursdays, 9:10 AM

Monthly
Not Published
Monthly
Sports12 sports12 sports12 sports6 sports
Links

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