Hi Ashima,

You will be allowed to take the NMAT exam a maximum of three times during the year’s testing period. This includes the first attempt plus a maximum of two retake attempts. No shows are considered attempts. 

While you can register for retake exam after your exam date, however you can schedule the retake exam date 15 or more days after your most recent date of attempt. This means you will have to wait at least 15 calendar days before you can appear for a retake. You can schedule your test any time during the retake scheduling window (subject to real time availability).

Hope this helps you.