Kishore, you have not mentioned which exam you are talking about. But since JEE Mains exam is being conducted at this time, I would answer for it. In case your question was meant for some other exam, please mention in the comments section.

So according to the 2018 JEE Mains results, the marks vs rank in the Common Rank List was as given below (Score : Rank format):

• 336 to 360 : 1-20
• 310 to 335 : 21-225
• 251 to 300 : 226-1492
• 201 to 250 : 1493-5752
• 151 to 200 : 5753-18377
• 101 to 150 : 18378-57131
• 51 to 100 : 57132-240541
• 1 to 50 : 240542-984170
• -40 to 0 : 984171-1074221

For rankwise college cutoff, you can visit the given website as the cutoff also changes depending on the branch you select: https://engineering.careers360.com/articles/jee-main-rank-list/amp

It contains the branch wise cutoff rank for NITs, IIITs and other GFTIs for the years 2018 and 2017. Hope it helps.