Hello Pallavi Sanjay Ekhande 

NEET Exam is conducted once in a year. If you fail in the exam or unable to score well then try again the next year. You have to complete wait for next years exam notification comes. Generally in the month of July next years Exam notification will be released. If you want repeat the exam then you have to wait untill the notification is released. These exams are conducted once in a year only. So be prepare for the exam if you want to repeat the exam again.

Hope this will helpful

Good Luck.