We don't recommend giving extra credit because the student has already had multiple attempts at each question and received partial credit if they corrected their answer.
But instead of worrying about grades, I would first supervise the student for a few weeks to make sure they are following the steps on the Instruction Sheets for each assignment type that are linked on page 1 of the Teacher Guide for your course: Shormann Math Teacher Guides
Extra Tips for Practice Sets:
Make sure your student is using the Help links above each question and following all the steps on the Practice Set Instructions, especially the steps on what to do when you are stuck on a problem and the steps on page 2.
Here are some other common issues that cause students to have low scores or take too long: Shormann Math: It takes too long to complete a lesson
However, if you still want to give extra credit, at the end of the course, you can add extra points. Please see "Extra Credit" in the Teacher Guide for your course.Shormann Math Teacher Guides & Tips