High School Vocabulary: Word List (1) for Grade 9 To be successful in high school, you need to learn a lot of words. This is especially important when you're taking classes that will help you in your future, like college. For example, when you're studying for a test, or reading a book, you need to know the right words to use. This will make it easier for you to understand what you're reading and to write things down correctly.Dictionary.com has put together a list of essential vocabulary words f