If you are teaching using ACT or College and Career Readiness bands, this quiz will focus on one single grammar skill in the 13-15 range. Quizzes like this are simple ways to show continuous improvement and/or show specific skills that are difficult for students.
10-question quiz is very specific. If your students all pass, don't bother to teach more. If the students need more work, you'll be able to identify what's causing the problems. I decided 10 questions was the right number. Some of our ELA teachers preferred five. Since we identified 80% as proficient, students could get two wrong on this quiz. Each department has to figure the goals out for themselves. This quiz just makes it an hour simpler.