Ninth Grade Language Arts?
>>>>What should I use for 9th grade Language Arts?<<<<
Focus on reading and writing at your student's level, and you can't go wrong. We used Sonlight for their writing prompts. It included workbooks for vocabulary. For young high schoolers who need extra help, Winston Grammar is a great way to get a good understanding of parts of speech (noun, verb, adjective, etc.) in a way that's very hands-on. If your student is a hands-on learner, then I really recommend Winston Grammar. But really, in high school it's often just about practice, practice, practice.
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