Hey! There is no limit for the number of times you can attempt AIIMS entrance, or the NEET-UG. You can attempt it annually. Some people take up to 3 years off to prepare for the entrance exams.
However the upper age limit is 25 years of age. So keep that in mind.
Assuming asking for Attempts, There is no limit to the number of attempts in AIIMS Entrance Exam. You can check the further eligibility about AIIMS Entrance exam with the given below link.
AIIMS MBBS Eligibility
Good Luck!
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