High school support · built to California standards
Most of these are not replacement courses. They are built to sit alongside the class your student attends in person, the method for every problem type, explained the way a tutor would explain it, and a large bank of extra practice where every single problem has a full worked solution, not just an answer key. Look up the topic you are stuck on, read how it is done, then drill it until it holds. Twelve courses are the exceptions so far: Biology, Chemistry, Physics of the Universe, Anatomy & Physiology, Algebra 1, Geometry, Algebra 2, Precalculus, Financial Algebra, Spanish 1, Spanish 2 and Spanish 3 have been rebuilt as full years on the diploma track, and the others are being rebuilt the same way one at a time.
Free to explore, the first topic in every course, no account needed to start.
How these courses work. Each one is organized by topic rather than by week, so a student can go straight to the thing their teacher covered today. Every topic opens with the method, what the problem is asking, the steps that solve it, and the mistakes that cost marks, followed by worked examples and then practice problems at increasing difficulty. Solutions show the full reasoning, so a student who gets one wrong can find the exact step where it went wrong. Coming: photograph your handwritten work and have it checked step by step, with the line where the error appears marked for you.
Linear equations and inequalities, systems, functions and sequences, exponential models, descriptive statistics, and the congruence and coordinate work that opens the geometry strand, 22 topics, 390 practice problems, every one with a full worked solution.
Open the course →Polynomials and factoring, quadratic functions and equations, similarity and right-triangle trigonometry, circles, measurement, and probability, 20 topics, 360 practice problems, every one with a full worked solution.
Open the course →Polynomial, rational and radical functions; exponential and logarithmic functions; trigonometric functions; sequences, series and function operations; and drawing conclusions from data, 18 topics, 330 practice problems, every one with a full worked solution.
Open the course →Rebuilt as a full year rather than a support course. Eleven units: expressions and units, linear equations and inequalities, functions and function notation, lines and their graphs, systems, sequences and exponential growth, polynomials and factoring, quadratic functions, solving quadratics four ways, radicals and rational expressions, and statistics with bivariate data. Every line of every solution follows from the line above it, and the student is shown why. 75 lessons, 880 practice problems, a formula and theorem reference that stays free, and two cumulative reviews.
Open the course →Rebuilt as a full year rather than a support course. Eleven units: foundations and constructions, reasoning and proof, parallel and perpendicular lines, transformations and congruence, congruent triangles, relationships within triangles, quadrilaterals, similarity, right triangles and trigonometry, circles, and area with surface area and volume. The governing rule is that every claim names the theorem that licenses it, so a proof here is a chain of reasons rather than a description of a picture. 75 lessons, 880 practice problems, a formula and theorem reference that stays free, and two cumulative reviews.
Open the course →Rebuilt as a full year rather than a support course. Eleven units: functions with transformations and inverses, quadratic functions and complex numbers, polynomial functions, rational expressions and functions, radicals and rational exponents, exponential functions and modeling, logarithmic functions, sequences and series, trigonometric functions, trigonometric identities and equations, and statistics with sampling and inference. The governing rule is to name the family before you touch the problem, because every technique in the course belongs to one. 75 lessons, 880 practice problems, a formula reference that stays free, and two cumulative reviews.
Open the course →Rebuilt as a full year rather than a support course. Eleven units: functions and transformations, polynomial and rational functions, exponentials and logarithms, angles and the unit circle, graphing sinusoids and inverse trigonometry, identities and trigonometric equations, the laws of sines and cosines, vectors, polar coordinates with complex numbers and parametric equations, conics with sequences and series, and limits leading to the derivative. The governing rule is to name the family before you touch the problem, because every technique in the course belongs to one. 75 lessons, 880 practice problems, a formula reference that stays free, and two cumulative reviews.
Open the course →The full-year course, with every lesson written from the ground up: pay and paychecks, income tax, budgeting and banking, simple and compound interest, saving and the time value of money, credit cards, loans, cars and housing, insurance, investing, and planning as a whole. Use it as support for the class your student is in, or as the whole course. 11 units, 75 lessons, 880 practice problems, every one with a full worked solution.
Open the course →Rebuilt as a full year rather than a support course. Eleven units: how biology establishes anything at all, energy flow and trophic efficiency, population dynamics, the cycles of matter and human impact, cells and membranes, photosynthesis and respiration, DNA to protein, mitosis and meiosis, inheritance, natural selection, and speciation and biodiversity on a changing planet. Every mechanism comes with the evidence that established it, and the exact wording that earns marks is named in every lesson. 75 lessons, 860 practice questions, six writing tasks built on claim, evidence and reasoning, and a science writing reference that stays free.
Open the course →Rebuilt as a full year rather than a support course. Eleven units: measurement and the evidence for atoms, the periodic table, bonding and shape, the mole, reactions, stoichiometry, energy and the heat balance of the planet, gases, solutions, kinetics and equilibrium, and acids ending in ocean chemistry. Every law comes with the measurement that established it, and every quantity is worked line by line with the unit conversions drilled until they are automatic. 75 lessons, 860 practice questions, six writing tasks built on claim, evidence and reasoning, and a science writing reference that stays free.
Open the course →A full year of grade 11 physics. Eleven units: motion and measurement, forces, momentum, gravitation and orbits, energy, heat and the second law, electric charge and circuits, magnetism and induction, waves and light, radiation and information, and the nucleus, the Sun and the origin of the elements. Nothing is asserted that can be derived, and every quantity carries its unit on every line. 75 lessons, 860 practice questions, six writing tasks built on claim, evidence and reasoning, and a science writing reference that stays free.
Open the course →Rebuilt as a full year rather than a support course. Eleven units: the language of anatomy and homeostasis, tissues and skin, bone, muscle, neurons and the brain, the nerves and senses, hormones, blood and the heart, breathing and immunity, digestion and metabolism, and filtration through to reproduction. No structure is ever introduced as a name on a list, and every pathway in the body is one you are made to trace in order until you can do it without hesitation. 75 lessons, 860 practice questions, six writing tasks built on claim, evidence and reasoning, and a science writing reference that stays free.
Open the course →A full first year of Spanish in eleven units: greetings and pronunciation, gender and agreement, ser and estar, the present tense with its irregular and stem-changing verbs, gustar, family and home, daily routines, food and shopping, the town and travel, and a first look at the past tense. Instruction is in English and every example is in Spanish. 75 lessons, 880 practice problems, a grammar reference that stays free, and two cumulative reviews.
Open the course →A full second year of Spanish in eleven units: a review of the first year, the preterite in depth, the imperfect and the choice between the two pasts, health and commands, travel with por and para, the home and daily life, technology and work with the present perfect, the future and the conditional, celebrations and connected writing, and a closing unit that puts the year together. Instruction is in English and every example is in Spanish. 75 lessons, 880 practice problems, a grammar reference that stays free, and two cumulative reviews.
Open the course →A full third year of Spanish in eleven units: a review of the second year, the present subjunctive, wishes and advice, emotion and doubt, clauses of description and time, the imperfect subjunctive, si clauses and the conditional, the perfect tenses, the passive and relative pronouns, reported speech and register, and a closing unit on literature, culture and a final presentation. Instruction is in English and every example is in Spanish. 75 lessons, 880 practice problems, a grammar reference that stays free, and two cumulative reviews.
Open the course →A tutor can work through it with your student live, then point them at the right practice set to make it stick.