Teach and reinforce our students the importance of using feedback they are getting. Also learning that making mistakes is ok and learning from those mistakes in the future is an important part of learning.
some examples:
(especially the part on page 2 that has students consider HOW they got something wrong)
https://www.apa.org/ed/precollege/topss/teaching-resources/exam-wrapper.pdf
(this example includes a homework wrapper)
https://www.cmu.edu/teaching/designteach/teach/examwrappers/
A better explanation of the why this is effective by one of the leaders in the field, Jose Bowen. See also his link with templates.