Hello candidate,

The National testing agency releases the correction facility window for the students to re-edit their entered information in their application forms such as parents information, personal academic records, mode of language selection for the examination, preferred test centres, and a variety of other information as well.  So, since you have not mentioned the examination for which you are interested to know about the dates for the correction facility window, it's not possible for me to help you out on a random basis.

If you have any further queries feel free to post it here!!