What constitutes a "good" score is entirely dependent on meeting the minimum passing score required by the state where you intend to teach. A score above the passing score is obviously better, as it might influence hiring decisions in a competitive market, but the bare minimum passing score is the true benchmark for success.
To find the passing score, you must contact the licensing board or Department of Education in the specific state where you plan to seek teacher certification. Their website will have the most up-to-date and accurate information.