The SAT writing test assesses a student's writing skills in several different areas, including:
1. Command of Evidence: The ability to use evidence correctly and effectively to support arguments and ideas.
2. Words in Context: The ability to understand and use context clues to determine the meaning of words.
3. Expression of Ideas: The ability to clearly and effectively convey ideas, information, and arguments in writing.
4. Standard English Conventions: The ability to use proper grammar, spelling, punctuation, and sentence structure.
5. Analysis: The ability to analyze complex texts and ideas, and draw conclusions based on evidence.
Overall, the SAT writing test evaluates a student's ability to write effectively and to demonstrate critical thinking skills while doing so. By assessing these skills, the exam aims to provide colleges and universities with insight into a student's potential for academic success.