Allow your students to develop metacognition by having them rate themselves on their own understanding of all concepts taught!
We use this for every subject throughout of the day. My students will write their level on this exit slips for every subject or for a quick gauge of the room, they will just show me with their fingers. I will often call back any students who feel they are a 1 or 2 to give them extra help while the 3's and 4's work independently.
I have these laminated and posted on my white board.
I have included two themed sets; one cactus and one succulent. Or mix and match!