Dear Saini, There is no limit on the number of times a candidate appears for NIMCET. There is no stated age limit to be eligible for the exam. The criteria that you need to meet are:

• Candidates must have studied B.Sc. / B.Sc. (Hons) / BCA / BIT/ B.E/ B.Tech of minimum three years full-time from a recognized University with Mathematics/ Statistics as one of the subjects.
• They must have minimum 60% marks in aggregate or 6.5 CGPA on a 10-point scales (55% marks or 6.0 CGPA on a 10-point scale in case of SC/ ST).
• Candidates in the final year of qualifying exam are also eligible. They must present the passing certificate before September 15, 2019.