A place for every
kind of learning.

Explore 50 topic-based chapters with questions and worked explanations. Covers algebra, functions, statistics, geometry, trigonometry, and Desmos.

Start with a diagnostic, follow targeted lessons and practice, and try independent checks. Includes saved progress and a teacher dashboard across eight selected skills.

Find questions by keyword, section, year, and difficulty. Search passages, options, explanations, and sources; sort by relevance or success rate.

Explore the question bank by topic and difficulty. Filter Math and Reading questions by subject, year, and level.

Browse the paper index and open questions in their original paper groupings, including Math and Reading & Writing sections.

Compare reading papers using question success rates. Explore hard Module 2 or the combined route, view time trends, and export data. Rankings are not SAT score predictions.

Build SAT vocabulary through learning and recall practice, with recorded pronunciations and exam-date planning. Create an account to save your progress.

Study a dedicated collection of SAT poetry and drama reading material, with source references for further exploration.

Browse TOEFL papers and their Reading, Listening, Speaking, and Writing modules from one index.

Search questions, passages, listening transcripts, answers, and speaking-coach content. Narrow results by module, question type, paper, or answer availability.

Prepare representative prompts that cover related speaking questions. Explore ranked prompts, study packs, Part 1 topics, and Part 2+3 groups in English or Chinese.

Choose a comprehensive or quarterly vocabulary exam. Students enter their details, answer questions, and submit their work.

Open the teacher dashboard for each vocabulary exam to monitor class progress and recorded submissions. Teacher sign-in is required inside each dashboard.

Choose which cards to turn over to test a rule. An interactive introduction to conditional reasoning, falsification, and confirmation bias, with feedback and explanations.

Test number sequences, record experiments, and propose the hidden rule. Discover how the way you test a hypothesis shapes what you learn.

Turn Chinese text or literary selections into printable practice sheets. Adjust fonts, tracing, stroke order, and grid styles, then preview, print, or download a PDF.

Write and run AP CSP-style pseudocode. Step through execution, inspect variables and lists, work with input and output, and experiment in a robot world.

Learn robot programming with Python- and Java-style Karel code. Includes guided lessons, step-by-step execution, Stanford mode, a world editor, and program/world import and export.

Learn to create Wave3D scenes with a step-by-step tutorial, an authoring guide, a core API reference, and practical project examples.

Turn an image into a destructible 3D voxel world. Try different weapons, level challenges, daily challenges, rescue mode, and sandbox play. Accounts sync game progress.