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Space it out
Split study sessions across days instead of cramming. Spaced repetition doubles long-term retention.
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Clean, well-organized study guides, subject summaries and exam prep — for students who want to understand, not just memorize.
Featured
Browse all subjects →Hand-picked study guides
A great place to start — the most requested and most useful guides in the library.
MathematicsExam prep
Algebra Essentials: From Variables to Quadratics
A structured walkthrough of the core algebra concepts every student should master before tackling advanced math.
12 min read
Biology
Cell Biology: Structure, Function and Division
Understand the building blocks of life, from organelles to the cell cycle and mitosis.
10 min read
PhysicsExam prep
Newtonian Mechanics: Forces and Motion
Master Newton's three laws and apply them to everyday motion problems.
14 min read
Subjects
See all 20 subjects →Popular subjects
Twenty core subjects from mathematics to music, each with its own library of guides.
Mathematics
Algebra, geometry, calculus, statistics and more.
Science
Foundational scientific concepts and the scientific method.
Biology
Cells, genetics, ecosystems and human biology.
Chemistry
Elements, reactions, bonding and organic chemistry.
Physics
Mechanics, waves, electricity and modern physics.
Earth Science
Geology, meteorology, oceanography and astronomy.
History
World civilizations, key events and historical thinking.
Geography
Physical geography, human geography and mapping.
Fresh
Recently updated
Guides we've revised in the last few weeks based on curriculum changes and student feedback.
Programming
Python Basics: Syntax, Types and Control Flow
11 min read
PhysicsExam prep
Newtonian Mechanics: Forces and Motion
14 min read
PsychologyExam prep
Memory and Learning: How the Brain Encodes
10 min read
Writing
Essay Structure: Introduction, Body, Conclusion
8 min read
Reading
Reading Comprehension: Active Reading Strategies
7 min read
MathematicsExam prep
Algebra Essentials: From Variables to Quadratics
12 min read
Exam preparation
Walk into your next exam prepared.
Focused guides built around what tends to show up on exams — key formulas, common pitfalls, and practice-friendly summaries.
Explore exam prepStudy tips
Evidence-based ways to learn better
A handful of research-backed habits that outperform the way most students study.
2
Test yourself
Retrieval practice — trying to recall without looking — is more effective than re-reading notes.
3
Interleave topics
Mix related problem types in a single session. It feels harder, but it builds stronger understanding.
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Explain it simply
If you can't teach a concept in plain language, you don't fully understand it yet. Fix the gap.