Learning Hub
Free revision material put together by our tutors and arranged subject by subject — mathematics, the sciences, and the language centre.
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The same revision material we use in real lessons. Open it for free — no sign-up.
Mathematics
គណិតវិទ្យាChoose a grade — every lesson, formula sheet and exercise set for that year sits inside.
Mathematics Grade 12
The whole Grade 12 syllabus — complex numbers, limits, derivatives, integrals, differential equations and probability, plus the formula book.
Grade 12 Formula Complex Numbers Limits Derivatives Functions Conics Vectors in Space Integrals Differential Equations ProbabilityMathematics Grade 9
Algebra, geometry and trigonometry for the lower-secondary examination.
Maths for Kindergarten
A first course for children aged four to six. Numbers 0 to 20 as digits, Khmer numerals and dots, shapes and patterns, comparing and measuring with cubes, adding and taking away within ten, and the clock, the riel and position words — then eight picture games. Every card reads itself aloud and carries the Khmer, so a child can use it before they can read.
Mathematics — Grade 12
គណិតវិទ្យា ថ្នាក់ទី១២Every Grade 12 chapter we have so far, in syllabus order. Each one is a lesson with worked examples followed by exercises — readable in Khmer or English.
Grade 12 Maths Formulas
Complex numbers, limits, derivatives, integrals, differential equations, conics, solid geometry and probability.
OpenComplex Numbers — lesson & exercises
The whole Grade 12 chapter: a lesson with worked examples, then 40 exercises including past national examination questions. Readable in Khmer or English.
OpenLimits of Functions — lesson & exercises
Limit laws, the 0/0 and infinity forms, trigonometric, exponential and logarithmic limits, and continuity — then 36 multiple-choice questions and 15 written exercises. Khmer or English.
OpenVectors in Space — lesson & questions
Coordinates and distance, the dot and cross product, equations of lines and planes, areas and volumes, the distance formulas and the sphere — then 43 multiple-choice questions.
OpenConics — lesson & exercises
The parabola, the ellipse and the hyperbola as reference tables — standard equation, vertex, focus, directrix, asymptotes and eccentricity, both centred at the origin and at I(h,k) — then 55 exercises in three sets.
OpenFunctions — lesson & exercises
Asymptotes, the plan for studying a function, variation, relative extrema, inflection points, symmetry, tangent lines and the position of two curves — then 33 exercises on rational, exponential and logarithm functions, curve sketching included.
OpenDerivatives — lesson & exercises
The definition, the chain rule, every standard derivative, higher derivatives and the differential — then 13 written exercises on tangents, variation and optimisation. Khmer or English.
OpenIntegrals — lesson & exercises
Antiderivatives, substitution, integration by parts, partial fractions, definite integrals and area under a curve — then 18 multiple-choice and 10 written exercises. Khmer or English.
OpenDifferential Equations — lesson & exercises
First and second order in one page: separable equations, integrating factors, variation of constants, the characteristic equation and undetermined coefficients — then 36 multiple-choice and 62 written exercises, plus the BaccII question from every year since 2002.
OpenGrade 12 Probability — lesson & exercises
The full lesson (sets, permutations, combinations, conditional probability and Bayes), then 108 exercises — dice, cards, draws and past national examination questions. Fixed practice order, searchable, with a progress tracker.
Past exam papers
Worked solutions to recent national examination papers.
Cambridge Curriculum
កម្មវិធីសិក្សា ខេមប្រ៊ីជThe Cambridge international programme, stage by stage. Written to the published curriculum framework and taught in English, for students following Cambridge at school or preparing for the Checkpoint tests.
Lower Secondary — Stage 7
The first year of Cambridge Lower Secondary. Mathematics is complete: all 30 units and the three section reviews, with summaries, worked examples, diagrams and graded exercises.
Mathematics Stage 7Lower Secondary — Stage 8
The second year of Cambridge Lower Secondary mathematics.
Lower Secondary — Stage 9
The final Lower Secondary year, leading to the Checkpoint tests.
Oxford Primary Years Programme
កម្មវិធីបឋមសិក្សា អុកហ្វតThe Oxford Mathematics series for the International Baccalaureate Primary Years Programme, year by year. Each topic teaches the idea first, then moves from guided practice to independent and extended work.
International Primary Maths 1
The first-year workbook in full: all 12 units and 38 topics, from counting objects to block graphs. Every topic has a Discover panel, three levels of practice, a picture glossary and answers.
Primary Maths 1 OpenPrimary Years Programme 4
The Year 4 student book in full. Mathematics is complete: all 10 units and 31 topics, with a worked concept panel, four stages of practice, a glossary and answers for every topic.
Mathematics 4Primary Years Programme 5
The Year 5 student book, following the same unit sequence.
Primary Years Programme 6
The final primary year, leading into Lower Secondary.
Cambridge Lower Secondary — Stage 7
ខេមប្រ៊ីជ អនុវិទ្យាល័យ ដំណាក់កាលទី៧Stage 7 is the first year of Cambridge Lower Secondary, taken at about age eleven to twelve. Each resource follows the curriculum framework unit by unit, with the lesson first and the practice after it.
Mathematics Stage 7 — summaries & exercises
All 30 units and the three section reviews, in syllabus order. Every unit has the learning objectives, a summary, key terms, worked examples, the mistakes to avoid, and exercises graded Warm-up, Core and Challenge — each with an answer. 171 diagrams, 85 of them drawn onto the questions themselves. Tick off what you finish, keep your own notes, and save your progress.
Science Stage 7
Biology, chemistry and physics for the Cambridge Lower Secondary science framework.
English Stage 7
Reading, writing, speaking and listening for the Cambridge Lower Secondary English framework.
Oxford PYP — Primary Years Programme 4
អុកហ្វត PYP ៤Year 4 of the Primary Years Programme, taken at about age nine to ten. Every topic follows the same shape: the idea is explained with a worked example, then practised four times over with the support gradually taken away.
Mathematics 4 — lessons & practice
All 10 units and 31 topics, in book order — place value, the four operations, fractions and decimals, money, patterns, measurement, shape, angles, symmetry and maps, data and chance. Each topic opens with a Learn it panel, then Guided, Independent, Extended and Extra practice. Type your answers into the page, click the hundred charts and shading grids, reveal the answer key when you are ready, and print any unit as a clean worksheet.
Practice & Mastery 4
The companion book of reinforcement activities and real-world problems.
Physics
រូបវិទ្យាFormula sheets and constant tables for mechanics, waves, electricity and modern physics. In preparation.
Grade 12 Physics formulas
Kinematics, dynamics, energy, waves, optics, electricity and magnetism.
Constants & units
SI units, prefixes and the physical constants used in the examination.
Chemistry
គីមីវិទ្យាThe complete reference sheet: the interactive periodic table, ion and radical tables, solubility rules, formulas, redox potentials and organic naming.
Periodic Table of the Elements
All 118 elements, colour-coded by family and searchable by touch — with the full chemistry reference underneath.
Grade 9 Chemistry basics
Atoms, bonding, equations and the mole, written for the lower-secondary syllabus.
Reaction practice
Balancing, stoichiometry and redox drills with instant answers.
Biology
ជីវវិទ្យាDiagrams, definitions and summary tables for cells, genetics, human systems and ecology. In preparation.
Cells & genetics summary
Cell structure, mitosis and meiosis, DNA and inheritance.
Human body systems
Digestive, circulatory, respiratory and nervous systems at a glance.
Language Centre
មជ្ឈមណ្ឌលភាសាChoose a language — the lessons, vocabulary and practice tests for it all sit inside.
English
From the first letter of the alphabet to the national examination — kindergarten English, tenses, grammar notes and examination vocabulary.
English for Kindergarten English Tenses Grammar Notes OpenChinese
From a four-year-old's first character to pinyin, the four tones, character writing, everyday conversation and the HSK test papers.
Chinese for Kindergarten Chinese for Beginners HSK 1 OpenKhmer
From a four-year-old's first letter to literature and essay structure for the national examination.
Khmer for Kindergarten Khmer literature notesEnglish
ភាសាអង់គ្លេសGrammar, tenses and vocabulary — the same lessons and tests we use in real classes, free to open.
English for Kindergarten
A first course for children aged four to six. The alphabet with the sound each letter makes, numbers to twenty, colours, shapes, eighty first words, sounding out little words and everyday phrases — then seven picture games. Every card reads itself aloud and carries the Khmer meaning, so a child can use it before they can read.
OpenEnglish Tenses — full practice course
All twelve tenses plus a mixed review. Every chapter has an Easy, Intermediate and Advanced test of thirty questions, each with a grammar explanation.
OpenGrammar notes
Articles, prepositions, conditionals, reported speech and the passive — rules, worked examples and a timed test for every chapter.
IELTS vocabulary builder
Academic word lists with example sentences and self-tests.
Chinese
ភាសាចិនMandarin from the very first character — pronunciation, writing and everyday speech with audio on every line, then the HSK papers when it is time to sit the test.
Chinese for Kindergarten
A first course for children aged four to six. Twenty-six starting characters as flip cards, the four tones, numbers to twenty, colours, shapes, eighty first words and everyday phrases — then seven picture games. A Chinese voice reads every card and the Khmer meaning sits underneath.
OpenChinese for Beginners
Pinyin and the four tones, sound practice, character writing, numbers, basic words and everyday conversations — pinyin above every sentence and audio on every line.
OpenHSK 1 — chapter tests
Fifteen tests, one for each lesson of HSK Standard Course 1, plus a final paper over the whole book. Every question uses only the words taught up to that lesson, and every answer comes with the reason. Free — students register with an email before starting.
HSK 2 — chapter tests
The same chapter-by-chapter papers over HSK Standard Course 2, taking the vocabulary to 300 words.
HSK 3 to 6
Practice papers for the higher levels, up to 5,000 words.
HSK vocabulary lists
HSK 1 to 4 word lists with pinyin, Khmer glosses and audio.
Khmer
ភាសាខ្មែរKhmer from the very first letter. The kindergarten course is open; the national examination material is being written now.
Khmer Conversational Mastery
Speak Cambodia’s language from day one. One hundred real-life situations across ten chapters — greetings and everyday basics, getting around, food and drink, shopping and money, somewhere to stay, and more — each with the Khmer script, a pronunciation guide and the English meaning. Read it as a 218-page book, or switch to the slide deck for the classroom. Written by Ngorn Kakteka.
OpenKhmer for Kindergarten
A first reading course for children aged four to six. All 33 consonants with the series each belongs to, the 23 vowel signs shown on both series, building syllables, ជើងអក្សរ, first words, the Khmer numerals and everyday phrases — then seven picture games, all answered by looking, so they work even on a phone with no Khmer voice.
Khmer literature notes
Set texts, essay structure and grammar for the national examination.
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