I allow students to correct failing papers three days from the date they receive the paper back (you can look on your parent portal for that date. It is the due date). Your child does not have to ask. He/she has a 45 minute Study Skills class they are suppose to use for corrections. Your child should not bring corrections home to do.
In reading, your child will be required to do an entirely different assignment to change a failing grade. He/She can not simply erase their wrong answer and change it.