This document provides a list of common grammatical errors to avoid on an exam, including issues with subject-verb agreement, article usage, prepositions, tense consistency, and punctuation. It highlights mistakes such as using "is" instead of "are" with plural subjects, omitting articles before nouns, using incorrect prepositions, mixing future and present tense, and improper punctuation. Students are advised to carefully proofread their work and choose grammatically correct options to avoid these common errors.