What is the difference between 'reading comprehension' and 'language usage/vocabulary' sections?

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The main idea is that reading comprehension measures your ability to understand and interpret written material. It focuses on extracting meaning from passages—the main ideas, details, how ideas connect, the author’s purpose, and what can be inferred. Language usage and vocabulary items, on the other hand, test how well you know grammar, sentence structure, and the meanings and correct use of words. So the statement that reading comprehension tests understanding of passages fits best, because it targets processing and interpreting text rather than grammar rules, vocabulary knowledge, handwriting speed, or memory recall.