Accuracy is crucial in avoiding grammatical errors that could impact your score. Common mistakes include incorrect verb forms, such as using “has” instead of “had” for past actions, and subject-verb agreement errors, such as “The data were” instead of “The data was.” Additionally, incorrect punctuation can lead to confusion, so it’s essential to use commas, periods, and other punctuation marks correctly. For instance, using a comma before a conjunction in a compound sentence (e.g., “The sales increased, and the company expanded”) is important for clarity.