Rectification in exam form

I received a provisional admit card for Nov 2018 exams due to mistakenly selecting the option of serving last 6mnths as on 1-11-2018 instead of selecting the option of completing 3yrs as on 31-10-2018 as my due date of termination of articleship is 29-10-2018.Since there is no option in correction window for this mistake...what to do to rectify it??Early response is highly appreciable.