Here's why:
* Common Noun: "Exam" is a common noun, referring to a general test. Common nouns are not capitalized unless they are at the beginning of a sentence.
* Proper Nouns: If "exam" is part of a proper noun, like "Final Exam" or "GRE Exam," then it is capitalized. This is because proper nouns are specific names of people, places, or things.
Examples:
* Not capitalized: I studied hard for my exam.
* Capitalized: The Final Exam will be held next week.
Let me know if you have any other questions about capitalization!