You should SEE EVIDENCE of your students' learning EVERYDAY. Exit Slips are an excellent way to ensure that your students are reflecting on their learning as well as a way to keep tabs on their progress. I would get them to pick 2 to answer.
Free Behavior Reflections Graphic Organizer from Laura Candler. Use this graphic organizer instead of the typical "time out" form to have students reflect on why they made the choices they made and how their choices affected others. This is awesome.
This visual think sheet is a simple way for students to reflect on their behavior and think of better choices for the future. The behavior visuals are perfect for kindergarten, grade or special education classrooms.