Tutorials Common Usage & Grammar Errors In this tutorial, we cover subject-verb agreement, pronoun-number agreement, run-on sentences, sentence fragments, verb form and tense, logical comparison, word order, parallelism, diction and idiom, adverb and adjective misuse, and case errors.   Identifying Sentence Errors In this tutorial, we cover focus, common errors, sentences without errors and trusting your instincts.   Improving Paragraphs Tutorial In this tutorial, we cover careful reading, improve sentences first, signal words, and testing your answers.   Improving Sentences Tutorial In this tutorial, we cover spotting errors, substituting changes, the advantages of short answers, parallel structure, and logical connections.   Sentence Completion Tutorial In this tutorial, we cover trying every word, understanding the context, breaking down words, avoid eye-catchers, contrast and support transitions, cause and effect transitions, and double-blanks.   Analogies Tutorial In this tutorial, we cover establishing the relationship, narrowing your approach, reversed relationships, grammatical information, secondary meanings, eliminating answers, and context.   Critical Reading Tutorial In this tutorial, we cover the types of questions, introductions, line numbers, notations, thesis sentences, conclusions, key words, technical terms, skimming, mood and tone, multiple meanings, inference questions, double passages, and positive approach.   Preliminary Math Tutorial In this tutorial, we cover eliminating silly answers, replacing variables, manipulating numbers, working backwards, and grid problems.   Math Strategies Tutorial In this tutorial, we cover what to trust, total distortion, visual representations, redrawing diagrams, missing lines, shaded regions, units, lists, symbols, and multiple equations.   Arithmetic Tutorial In this tutorial, we cover rules for zero, rules for one, absolute values, opposites, multiplying/dividing positive and negative numbers, reciprocals, positive and negative addition, distributive law, integers and prime numbers, exponents and inequalities.   Quantitative Comparison Tutorial In this tutorial, we cover the basic rules of quantitative comparison, equality test, comparing first, and fixed numbers.