learn.koydo.app
Free study guides for the world's major credential exams.
Citation-backed pass-rate data, sample questions, and study tips — organised by exam, topic, and locale. Built by Koydo Studios as the open companion to the Koydo question bank.
v1 covers 8,325 unique guides across 3 beachhead exams (8,688 total pages including hubs and indexes).
Beachhead exams
Three exams, fully populated for v1. Each has 10–17 topic guides calibrated for five candidate locales.
CDL
Commercial Driver License
The U.S. Commercial Driver License qualifies professional drivers for Class A, B, and C trucks plus passenger and hazardous endorsements.
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NCLEX-RN
National Council Licensure Examination for Registered Nurses
The NCLEX-RN is the entry-level licensure exam for registered nurses across the United States, Canada, and 24+ international jurisdictions.
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IELTS
International English Language Testing System
IELTS is the world's most widely accepted English-proficiency test for university admission, professional registration, and migration.
Browse topics →
All exams in the registry
The full exam registry. Beachhead exams are populated; the rest are part of the v2 build target (8,325 v1 pages today; ~15,000 pages once every exam ships content).
- CDL LIVEcommercial
- NCLEX-RN LIVEmedical
- IELTS LIVElanguage
- MCAT medical
- GRE graduate
- GMAT graduate
- ACT undergraduate
- SAT undergraduate
- JEE Main undergraduate
- GATE graduate
- NEET medical
- CUET undergraduate
- KCSE undergraduate
- WAEC undergraduate
- JAMB undergraduate
- KET language
- PET language
- FCE language
- CAE language
- CPE language
- HSK language
- JLPT language
- DELE language
- DELF language
- Abitur undergraduate
- Matura undergraduate
- KPSS professional
- EmSAT undergraduate
- GAT (KSA) undergraduate
Locale framing
Every guide is calibrated for a specific candidate population — pass rates, regulatory context, and cultural framing all change by locale.
- United StatesAmerican candidates~3 million+ candidates / year
- United KingdomBritish candidates~500,000+ candidates / year
- IndiaIndian candidates~15 million+ candidates / year
- PhilippinesFilipino candidates~2 million+ candidates / year
- NigeriaNigerian candidates~5 million+ candidates / year
- MexicoMexican candidates~1 million+ candidates / year
- BrazilBrazilian candidates~4 million+ candidates / year
- GermanyGerman candidates~600,000+ candidates / year
- FranceFrench candidates~500,000+ candidates / year
- SpainSpanish candidates~450,000+ candidates / year
- JapanJapanese candidates~700,000+ candidates / year
- South KoreaKorean candidates~600,000+ candidates / year
- ChinaChinese candidates~12 million+ candidates / year
- Saudi ArabiaSaudi candidates~300,000+ candidates / year
- EgyptEgyptian candidates~600,000+ candidates / year
- Texas, USATexan candidates~350,000+ candidates / year
- Florida, USAFloridian candidates~275,000+ candidates / year
- California, USACalifornian candidates~600,000+ candidates / year
- New York, USANew Yorker candidates~300,000+ candidates / year
- Maharashtra, IndiaMaharashtrian candidates~1,800,000+ candidates / year
- Karnataka, IndiaKannadiga candidates~900,000+ candidates / year
- Tamil Nadu, IndiaTamil candidates~1,200,000+ candidates / year
- Luzon, PhilippinesLuzon-based Filipino candidates~1,200,000+ candidates / year
- Visayas, PhilippinesVisayan Filipino candidates~500,000+ candidates / year
- Lagos, NigeriaLagosian candidates~700,000+ candidates / year