Examiners look for evidence of grammatical variety and accuracy in your writing. This means using a mix of simple, compound, and complex sentences effectively. For Band 6, you should demonstrate an ability to use a variety of sentence forms, while Band 7 requires a wider range of complex structures. To achieve Band 8 or 9, you must show a comprehensive range of grammatical structures with very few errors. Common issues that affect accuracy include incorrect verb tenses, subject-verb agreement errors, and punctuation mistakes. For example, using “was” instead of “were” can lead to inaccuracies in describing past data. Additionally, proper use of commas, periods, and other punctuation marks is essential for clarity.