What we do
The site covers five subjects — mathematics, physics, chemistry, biology and computer science — organised across six stages: primary, junior high, senior high, undergraduate basics, undergraduate advanced and special topics. Each stage is a tree of topics, chapters and knowledge points, and you can start anywhere.
We think abstract ideas need something you can touch: open a formula to see what each symbol means, drag a parameter and watch the graph change, click an edge or an angle in a figure to see how the parts relate.
How the content is organised
Each knowledge point is assembled from core concepts, formulas, theorems, derivations, diagrams, experiments, worked examples, exercises, common misconceptions and glossaries — only the parts that actually help.
Practice questions come from the exercise bank attached to each knowledge point. The practice centre rebuilds a paper by subject, chapter, difficulty and question type. A practice run is never saved; only questions you get wrong stay in the local wrong-answer book.
Toolbox
Beyond the lessons there is a formula sheet, calculators (basic, fraction, GCD/LCM, ratio, rectangle, triangle, right triangle), an equation solver, unit conversion, a periodic table, a function grapher and a molecule viewer.
Contact
For corrections, partnerships or anything else, write to the address below.