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Numbers and arithmeticFractions, decimals, percent and ratio, taught with fraction bars you shade yourself and practice questions that show every calculation.Fractions
AlgebraExpressions, linear equations, lines, functions and parabolas, with spreadsheet, graph and function labs that test each step before you trust it.Linear equations Graphs of lines
Geometry and drawingsAngles, triangles, circles, solids and trigonometry, with a protractor you drag, solids that unfold in 3D and triangles whose corners you can move.Angles Trigonometry

ChemistryStates of matter, atoms, the periodic table, bonds, reactions and acids, with 3D particle models, molecules to turn and a titration you can run.Atoms The periodic table Chemical bonds
BiologyFive biology courses, from a 3D cell you can cut in half to a beetle lab where natural selection plays out one generation at a time.Cells
Human bodySix courses on how the body works, with a 3D heart you can cut open and a skeleton whose joints move. General information, not medical advice.The skeleton Heart and blood
Astronomy and spacePlanets, the Moon, stars, galaxies and rockets, with a 3D solar system you can switch to true scale and a sky dome set to any place and date.The solar system

World geographyContinents, oceans, countries and capitals, rivers and mountains, and topographic maps, learned on a globe you turn and a 3D landscape you can measure.Countries and capitals

SpanishSpanish spelling follows sound closely, so these courses start with how to read any word aloud, then move on to greetings for a first conversation.Spanish alphabet and pronunciation Spanish greetings
JapaneseLearn to read hiragana and katakana, the two sets of 46 basic kana, with recordings to repeat and dictation typed on a Japanese keyboard.Japanese hiragana and katakana
KoreanLearn to read Korean from its 24 basic letters, with recordings to copy, dictation on a Korean keyboard and the sound rules behind the spelling.Korean Hangul: letters and sounds

Play an instrumentPiano, guitar, ukulele and drums on instruments that sound on the page, plus a grid where you write eight bars and share the song as a link.Piano first steps

Computer basics and typingWhat happens inside a computer and across the internet, how to keep accounts safe, and touch typing on English and Korean keyboards.Touch typing How the internet works
ProgrammingJavaScript and Python from the first line, then algorithms and data structures, with code you edit and run in the page and labs that count every step.JavaScript Algorithms Data structures
Making websitesHTML, CSS and web accessibility, written by hand in a live editor that shows your page as you type and checks it before you move on.HTML CSS Web accessibility
Spreadsheets and dataSpreadsheets in Excel and Google Sheets, from the first cell to IF and VLOOKUP, with a working sheet in every unit that checks your tasks as you type.Spreadsheet basics Spreadsheet formulas

Test prepPractice for the U.S. citizenship interview with the official USCIS civics questions, a 20-question mock test and the English word lists.US citizenship civics test