There is no one-size-fits-all answer to this question since every grammar curriculum is different. However, some common topics that are typically covered in a 6th grade grammar class include parts of speech (nouns, verbs, adjectives, adverbs, etc.), sentence structure (subject-verb agreement, using correct verb tenses, etc.), and punctuation marks. If you need help with a specific grammar rule, there are many online resources and forums that can provide guidance.