Hello Arjun
Cutoff vary every year and depends on various factors so it would be difficult to provide you the exact marks. However, according to the AIIMS 2018 cutoff, 236 was the last rank for admission to AIIMS New Delhi in OBC Category.
You can go through the link below to check the previous year AIIMS cutoff for reference

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

Good Luck!

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