Separate the three problems so you can improve them deliberately instead of trying to fix everything during full cases.

Structure is the logic of your answer, communication is how clearly you explain it, and terminology is mostly familiarity with common business concepts. They overlap, but each responds to different practice.

You could do short structuring drills, explain each structure aloud in plain language, and keep a small glossary of business terms you repeatedly encounter rather than memorizing jargon for its own sake.

Record yourself explaining a case structure for two minutes. Review whether the logic is clear before worrying about sophisticated wording. Then add targeted terminology study only where a knowledge gap is actually blocking understanding. Keep a short note of what improved and what still broke so the next practice session has a clear purpose. Related CaseBasix guide: https://www.casebasix.com/pages/case-interview