The marks vs rank list is not available officially for any IIT JAM exam.
But I would give an approximate rank vs marks list for IITJAM chemistry.
Marks:70 and above- R ank :less than 20
Marks:65-69 -rank :20-50
Marks:60-64- rank:51-150
Marks:55-59-rank:151-250
Marks:45-54- rank:251-500
Hope this helps
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