In order to not only remember to do them, but to check and catalog them I've 'donated' a front bulletin board for that specific purpose.
Each student in my class has a number, but this could easily work with letters, or the name of the student. It really makes no difference.
I bought a pack of miniature black paw prints (that I've used in previous posts) and a silver sharpie and went to work.
Students will have a question posed on the board and must respond on a sticky note. Before the exit the room they must stick their sticky note on their numbered paw print!
After the kiddos leave I can take my time in looking over the answers to see which students grasped a particular concept and which students didn't.