鉄緑会
Tetsuryokukai is a 1983-founded Tokyo University entrance exam preparation school that admits students from designated elite six-year integrated secondary schools. It delivers in-person instruction by Tokyo University graduates and publishes proprietary exam-prep textbooks via KADOKAWA.
- Company typePrivate
- Founded1983
- HeadquartersTokyo, Japan
- Headcount1–10
- GTM typeB2C
- OfferingServices
What 鉄緑会 does
Tetsuryokukai is a Tokyo University entrance exam preparation institution founded in 1983 by Tokyo University Medical School and Law School students and graduates, targeting students enrolled in elite six-year integrated secondary schools (中高6年一貫校). Its name derives from the Medical School alumni association Tetsumon Club and the Law School alumni association Ryokukai. The core service is in-person classroom instruction delivered at its single Shibuya-ku headquarters, with 3-hour sessions taught almost exclusively by Tokyo University graduates and current students selected through a multi-criteria screening process. Enrolment is selective and admission-tested, with students drawn from a closed list of designated feeder schools including Kaisei, Otsukiyoin, Komaba, Azabu, Kaijo, and similar institutions, totaling roughly 7,000 enrolled students.
The underlying operating technology is a proprietary TeX-based ecosystem integrated with macOS, used internally to author educational materials, typeset chemical formulas (via chemfig), and run a digital exam grading system that automates scoring of common entrance exam formats including unordered-answer matching questions. This TeX infrastructure has been presented internationally at TeX Users Group (2013, 2019, 2025), TeXConf (2017, 2025), and BachoTeX (2025), and the organization has contributed Japanese-language improvements upstream to TeXShop.
Revenue is generated through three streams: recurring tuition for classroom instruction and member-portal services; one-time textbook sales through a core publishing partnership with KADOKAWA (including the Tetsuryokukai Note notebook sub-brand, the Teppeki English vocabulary series, and annual updated problem books across math, classical literature, physics, and chemistry); and ancillary content distribution through Amazon Japan and physical bookstore channels. A separate Benesse-operated Tetsuryokukai Individual Tutoring Center extends the brand into one-on-one instruction under a licensing arrangement. No external venture, private equity, or public market funding is referenced, and revenue is not publicly disclosed.
鉄緑会 firmographics
Firmographics- Name
- 鉄緑会
- Legal name
- 鉄緑会
- Website
- https://tetsuryokukai.co.jp
- Company type
- Private
- Founded year
- 1983
- Operating status
- Operating
- Headcount range
- 1–10 employees
- Short description
- Tetsuryokukai is a 1983-founded Tokyo University entrance exam preparation school that admits students from designated elite six-year integrated secondary schools. It delivers in-person instruction by Tokyo University graduates and publishes proprietary exam-prep textbooks via KADOKAWA.
- Ownership category
- akta.pro rank
鉄緑会 industry classification
Industry- Product category
- University Entrance Exam Preparation Services
- NAICS
- Exam Preparation and Tutoring (611691), Educational Services (611)
- SIC
- Services-Educational Services (8200)
- akta.pro primary industry
- Test-Taking Strategy, Diagnostics & Score Improvement Coaching (cross-exam) (EDANABAJ)
- akta.pro secondary industry
- Exam Preparation Materials (IELTS, TOEFL, Cambridge, etc.) (EDAGAHAE)
Keywords
Where 鉄緑会 is headquartered
LocationHeadquarters
- HQ city
- Tokyo
- HQ country
- Japan
- HQ region
- Asia
Offices1 record
Markets served
鉄緑会 business model
Business model- GTM type
- B2C
- Offering type
- Services
- Cost components
- Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure
Revenue model
- Tutition and classroom instruction fees: Recurring tuition fees for elite Tokyo University entrance exam preparation courses. Students attend 3-hour sessions with dedicated instructors. Additional individual guidance and catch-up instruction provided as needed.
- Textbook and study materials sales: Sale of proprietary exam preparation textbooks including the Teppeki (鉄壁) English vocabulary series, past exam analysis books covering 40 years of Tokyo University mathematics, and subject-specific question banks published through KADOKAWA distribution.
- Online services and member portal: Video streaming services for absent students and online registration/communication through member portal system.
Go-to-market motion3 records
Distribution channels4 records
Marketing channels5 records
鉄緑会 product offering
Product offeringCore offering
鉄緑会 provides specialized Tokyo University entrance exam preparation through in-person classroom instruction at its Tokyo headquarters, restricted to students from elite designated 6-year integrated secondary/high schools. The instruction is delivered by Tokyo University graduate instructors in 3-hour sessions, supplemented by a student/parent online portal for administrative tasks and a video streaming service for absent students. The school also publishes proprietary exam preparation textbooks and study materials through KADOKAWA for both enrolled students and external candidates.
Product overview
鉄緑会 is a Tokyo University entrance exam preparation school founded in 1983, offering a suite of face-to-face group instruction programs and published educational materials. The core offering is live, in-person coaching delivered by Tokyo University graduates and current students, supplemented by a student/parent portal (鉄緑会マイページ) and a video streaming service for absent students. The published materials portfolio includes annual updated problem books for Tokyo University exams across four subjects (Mathematics, Classical Literature, Physics, Chemistry), the Teppeki English vocabulary textbook (with companion audio CDs), and English listening comprehension guides — all published through KADOKAWA. Additional published products include advanced-level physics problem collections (登竜門 series), a physics strategy guide, and the Tetsuryokukai-authorized original notebook. These publications are co-branded and sold commercially to both enrolled students and external exam candidates.
Differentiator
Problem solved
Functional benefit
Brands
- 鉄緑会 式ノート術 (Tetsuryokukai Note Method): The Tetsuryokukai-style note-taking technique, for which they published a dedicated notebook product.
Products and services
- Tokyo University Entrance Exam Classroom Instruction In-person group coaching for elite 6-year integrated secondary/high school students targeting Tokyo University admission. Sessions are 3 hours long with full-time Tokyo University graduate instructors and include mandatory catch-up instruction.
- 鉄緑会マイページ (Student/Parent Portal) Online portal for enrolled students and their parents providing absence/lateness reporting, course registration, official communications from 鉄緑会, and class/schedule confirmation.
- Absent-Student Class Video Streaming Service On-demand streaming of recorded classroom instruction provided to enrolled students who miss live sessions, with recommended browsers Chrome, Firefox, Edge, and Safari.
- 鉄緑会 東大数学問題集 1981-2020【40年分】 (Tokyo University Math Problem Book 40 Years) Comprehensive 40-year compilation and analysis of Tokyo University mathematics entrance exam problems, sold commercially to exam candidates.
- 改訂版 鉄緑会 東大英単語熟語 鉄壁 (Revised Teppeki English Vocabulary Textbook) 鉄緑会's proprietary English vocabulary textbook, the culmination of the school's exam-prep methodology, targeting competitive university exam candidates.
- 改訂版 鉄緑会 東大英単語熟語 鉄壁CD (Audio CD Companion to Teppeki) Audio companion set to the Teppeki English vocabulary textbook enabling audio-based study aligned with 鉄緑会's methodology.
- 鉄緑会 東大英語リスニング (Tokyo University English Listening Practice) Definitive Tokyo University English listening comprehension practice book and study guide designed as the standard resource for all students targeting Tokyo University.
- 2027年度用 鉄緑会 東大数学問題集 (2017-2026) Annual updated edition of 鉄緑会's Tokyo University mathematics problem book for the 2027 academic year, covering exam years 2017-2026.
- 2027年度用 鉄緑会 東大古典問題集 (2017-2026) Annual updated edition of 鉄緑会's Tokyo University classical literature (Japanese language and literature) problem book for the 2027 academic year.
- 2027年度用 鉄緑会 東大物理問題集 (2017-2026) Annual updated edition of 鉄緑会's Tokyo University physics problem book for the 2027 academic year, covering exam years 2017-2026.
- 2027年度用 鉄緑会 東大化学問題集 (2017-2026) Annual updated edition of 鉄緑会's Tokyo University chemistry problem book for the 2027 academic year, covering exam years 2017-2026.
- 難関大入試 鉄緑会 物理問題集 登竜門 ～力学・熱力学篇～ Advanced-level physics problem book targeting competitive university entrance exams, covering Mechanics and Thermodynamics topics.
- 難関大入試 鉄緑会 物理問題集 登竜門 ～波動・電磁気・原子篇～ Advanced-level physics problem book targeting competitive university entrance exams, covering Wave Motion, Electromagnetism, and Atomic Physics topics.
- 鉄緑会 物理攻略のヒント －よくある質問と間違い例－ Physics exam strategy guide compiling frequently asked questions and common mistakes to guide students toward the most efficient path to physics comprehension.
- 鉄緑会ノート (Tetsuryokukai Notebook) 鉄緑会-authorized original notebook optimized for practicing the 鉄緑会-style note-taking method.
Quantifiable outcome
- 525 Tokyo University admissions in 2026 alone
- +3 more outcomes
Companies that use 鉄緑会
Customer profileNamed customers4 records
Segments2 records
Ideal customer profiles2 records
鉄緑会 technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature4 records
鉄緑会 partnerships and signals
Strategic signalPartnerships
Two partnerships are on record, tiered core and minor.
- KADOKAWA (角川)corePrimary publishing partner for Tetsuryokukai textbook series. Manages distribution through Kadokawa store, product pages, and retail channels. Publishes 'Tetsuryokukai Note' and all exam preparation materials including the 40-year Tokyo University mathematics question bank and other subject-specific study guides.
- Benesse Tetsuryokukai Individual Tutoring Center (ベネッセ鉄緑会)minorBenesse-operated individual tutoring centers under Tetsuryokukai brand. Results included in official statistics. Managed separately from main school operations.
Scale indicators8 records
Recent moves6 records
Expansion highlights5 records
鉄緑会 competitors and assessment
Company assessmentDirect peers
- 代々木ゼミナール (Yoyogi Seminar): Traditional Japanese cram school chain with historically strong Tokyo University placement. Closely comparable target customer and product offering though with broader geographic distribution than Tetsuryokukai.
- 河合塾 (Kawaijuku): Major Japanese prep school chain with nationwide campus network and prominent Tokyo University track record. Competes directly for elite student market with both in-person and online offerings across all subjects.
- 早稲田アカデミー (Waseda Academy): Japanese prep school chain with strong Tokyo University placement results. Direct competitor for elite university aspirants with broader geographic presence and a wider range of grade levels served.
- Z会 (Z-KAI): Japanese correspondence education provider serving elite university aspirants including Tokyo University preparation. Comparable in target customer and subject coverage though delivered primarily through distance learning.
- 駿台予備校 (Sundai): One of Japan's largest private cram school chains with a long-standing strong track record for Tokyo University admissions. Direct competitor serving elite university aspirants nationally with comparable 6-year integrated curriculum support.
- 東進ハイスクール (Toshin High School): Large Japanese prep school chain known for satellite classroom model and AI-driven adaptive learning (atama+). Directly competes for Tokyo University aspirants with technology-enhanced offerings.
- 四谷大塚 (Yotsuya Otsuka): Major Japanese prep school focusing on elementary through secondary students targeting top universities. Comparable competitive set with nationwide network though with stronger middle-school focus than Tetsuryokukai.
Others
- Benesse Corporation: Major Japanese education company operating the Benesse Tetsuryokukai Individual Tutoring Center under co-brand. Strategic partner with shared student outcomes but broader K-12 and correspondence education portfolio.
Emerging players
- SEG (SEG Educational Center): Specialized Tokyo cram school known for advanced math and science preparation serving elite university aspirants. Comparable focus on high-achieving secondary students though with narrower subject focus than Tetsuryokukai.
Regional players
- SAPIX中学部 (SAPIX): Elite Japanese prep school serving middle-school students targeting top high schools and universities. Comparable in student caliber and feeder-school approach though with primary focus on middle-school curriculum.
Market position
Strengths5 records
Weaknesses5 records
Key risks6 records
Key highlights7 records
Customer concentration
鉄緑会 social profiles
Digital presence鉄緑会 financial estimates
Financial estimateRevenue estimate
Valuation estimate
鉄緑会 leadership team
Management profileNumber of profiles
鉄緑会 funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
鉄緑会 M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about 鉄緑会
What does 鉄緑会 do?
鉄緑会 provides specialized Tokyo University entrance exam preparation through in-person classroom instruction at its Tokyo headquarters, restricted to students from elite designated 6-year integrated secondary/high schools. The instruction is delivered by Tokyo University graduate instructors in 3-hour sessions, supplemented by a student/parent online portal for administrative tasks and a video streaming service for absent students. The school also publishes proprietary exam preparation textbooks and study materials through KADOKAWA for both enrolled students and external candidates.
Is 鉄緑会 a public or private company?
鉄緑会 is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was 鉄緑会 founded?
鉄緑会 was founded in 1983. It employs 1 to 10 people.
Where is 鉄緑会 based?
鉄緑会 is headquartered in Tokyo, Japan, in the Asia region.
How does 鉄緑会 make money?
Three revenue lines are on record. Tutition and classroom instruction fees are the primary driver. The others are textbook and study materials sales and online services and member portal.
Who are 鉄緑会's main competitors?
Direct peers on record are 代々木ゼミナール (Yoyogi Seminar), 河合塾 (Kawaijuku), 早稲田アカデミー (Waseda Academy), Z会 (Z-KAI), 駿台予備校 (Sundai), 東進ハイスクール (Toshin High School) and 四谷大塚 (Yotsuya Otsuka). Benesse Corporation is listed as an others. SEG (SEG Educational Center) is listed as an emerging player. SAPIX中学部 (SAPIX) is listed as a regional player.
Does 鉄緑会 have an API?
No public API is recorded for 鉄緑会.
What industry is 鉄緑会 in?
鉄緑会's product category is University Entrance Exam Preparation Services. Its primary akta.pro industry code is EDANABAJ, Test-Taking Strategy, Diagnostics & Score Improvement Coaching (cross-exam), with a secondary code of EDAGAHAE, Exam Preparation Materials (IELTS, TOEFL, Cambridge, etc.). Its NAICS code is 611691 and its SIC code is 8200.