Hello Krishna,
AIIMS MBBS entrance exam is conducted for admission to 9 AIIMS institutes located in New Delhi, Bhopal, Bhubaneswar, Guntur, Jodhpur, Nagpur, Panta, Raipur and Rishikesh.

Apart from NEET UG and JIPMER, AIIMS MBBS is the only entrance exam for admission to medical course. So, it becomes one of the most important medical exam for aspirants. And, to get seat in top AIIMS institute like AIIMS New Delhi, candidate must work hard and score really well in the exam. It would be difficult to tell you the score as AIIMS authorities do not release the marks for admission. However, AIIMS, New Delhi MBBS 2018 Last rank for General category was 53 so one must aim to get  rank between 50-60 for admission to this campus.
You can go through the link below to check the previous year AIIMS MBBS category wise cutoff of institutions to have an idea about the rank required.

 https://medicine.careers360.com/articles/aiims-mbbs-cut-off

Good Luck!

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