I thought this was a great example of a way to get students to do some cognitive learning for extra credit points through something called “second chance exam.” This was taken from a Faculty Focus article: “Revisiting Extra Credit Policies,” by Maryellen Weimer, PhD. https://www.facultyfocus.com/articles/teaching-professor-blog/revisiting-extra-credit-policies/#poll. The followup comments at this site also give some good suggestions.

Here’s how it works. The instructor attaches a blank piece of paper to the back of every exam. Students may write on that sheet any exam questions they couldn’t answer or weren’t sure they answered correctly. Students then take this piece of paper with them and look up the correct answers. They can use any resource at their disposal short of asking the instructor. At the start of the next class session, they turn in their set of corrected answers which the instructor re-attaches to their original exam. Both sets of answers are graded. If students missed the question on the exam but answered it correctly on the attached sheet, half the credit lost for the wrong answer is recovered.

Has anyone tried something like this? Do you give extra credit points? How so?