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The most commonly tested biology, biochemistry, general and organic chemistry, physics, and psychology and sociology concepts, organized by content category.

Common GRE words, each with a definition, part of speech, an example sentence, and a synonym.

High-frequency words from recent SAT exams, each with a definition, part of speech, and a usage example.

Major drug classes, mechanisms of action, common indications, common side effects, and key nursing or patient considerations.

Vital signs, infection control, medication administration, common lab values, pharmacology categories, prioritization frameworks, and safety basics.

Common prefixes, suffixes, and root words used to build medical terms, organized by body system with example terms for each.

Budgeting, the time value of money, compound interest, credit and credit scores, debt types, investing basics, retirement accounts, taxes, and insurance.

Contracts, torts, agency, business entities (sole proprietorship, partnership, LLC, corporation), intellectual property, and employment law.

The four Ps, market segmentation, targeting, positioning, the marketing funnel, branding, and consumer behavior basics.

The accounting equation, debits and credits, journal entries, the four core financial statements, accrual versus cash accounting, and depreciation methods.

HTML structure, CSS selectors and the box model, JavaScript basics, the DOM, HTTP methods, and how the browser, server, and database fit together.

SELECT, WHERE, JOIN types, GROUP BY, HAVING, aggregate functions, subqueries, indexes, and normalization.

Arrays, linked lists, stacks, queues, hash tables, trees, graphs, sorting algorithms, searching algorithms, and time and space complexity.

Syntax, data types, lists, dictionaries, tuples, sets, control flow, functions, classes, and common standard library modules.

Variables, data types, control flow (conditionals and loops), functions, arrays and lists, basic recursion, and an introductory look at Big-O notation.

Pinyin and tones, numbers, common greetings, days and dates, family terms, food, and the most common beginner characters with their meanings.

High-frequency Latin words, the five noun declensions, the four verb conjugations, and common phrases used in English.

Greetings, numbers, articles and gendered nouns, family, food, clothing, and basic verb conjugation in the present tense. Each card pairs the German word with its English meaning.

Greetings, numbers, family, colors, food, clothing, the body, weather, and common present-tense verbs. Each card pairs the French word with its English meaning.

Regular AR, ER, and IR verbs across the present, preterite, imperfect, future, and conditional tenses, plus common irregular verbs.

Greetings, numbers, days, months, family, colors, food, clothing, the body, and common verbs in the present tense. Each card pairs the Spanish word with its English meaning.

Parts of speech, subject-verb agreement, pronoun usage, verb tenses, punctuation, sentence structure, and common usage errors.

High-frequency academic words used on standardized tests, each with a definition, part of speech, and an example sentence.

Major plays (Hamlet, Macbeth, Romeo and Juliet, Othello, King Lear, A Midsummer Night's Dream, Julius Caesar), key characters, themes, famous quotes, and historical context.