AIIMS MBBS Entrance examination is conducted every year for admission to AIIMS Delhi and other AIIMS colleges based on merit. Admission is done on the basis of marks scored in the entrance exam and no other exam is required to take admission in AIIMS.
All India Pre Medical Test (AIPMT) is an annual medical-college entrance examination in India. The exam is conducted by the Central Board of Secondary Education (CBSE), Delhi for admission to MBBS and BDS courses in several medical colleges around the country. At present, 15% of the total seats in all medical and dental colleges run by the Union of India, state governments, municipal or other local authorities in India
AIIMS score is only used for admission in all AIIMS colleges. AIPMT is for all colleges (almost) for 15% seats but not for AIIMS.