Skimming 5. Skimming is the skill of reading quickly to get a general idea of a passage. Skimming involves looking for information and clues that give you an idea of a passage's topic, main idea, and overall organization. When you take the TOEFL, begin each new passage by skimming it. Read only the key sentencesto get the main idea. Read the first and the last sentence of each paragraph. Skim th..