Admission to IIT Delhi is offered on the basis of Your ranks in JEEAdvance and Not Mains, In mains, You just needs to qualify it to appear for jee advanced.

For CSE at IIT Delhi, You need a rank below 100(open)

For other categories, it is as follows

OBC           67(

Best IIT college in Many ranking is IIT Bombay, Now cutoffs are different for Different courses and different categories, Since You does not mention any Branch and category, You can go to the opening-closing rank portal of JoSAA which will help you to determine the rank you need to get

Dear Aspirant.

IIT Delhi is considered one of the top amd finest IITs.

The score vary every year but you have to score aproximately 280+ in advance and 300+ for CSE branch. Ie. Less than 200 rank.

All the Best, further queries are always welcomed.

Fee structure for General and OBC category students with families annual income less than 5lac and above 1lac is 57,500 ruppes all inclusive per year for Btech Course via Jee Advanced exam. 

Fee brekaup shared below. 

http://academics.iitd.ac.in/sites/default/files/utility/forms/Fee%20Structure%202018-19-UG%20andPG.pdf

Fee structure for IIT delhi engineering physics for General category and OBC NCL category having annual family income above 1lac and less than 5lac shall need to pay approximately 41,000 to 50000 range of fees per year. 

Detailed fee structure below. 

https://www.google.co.in/url?sa=t&source=web&rct=j&url=http://academics.iitd.ac.in/sites/default/files/utility/forms/FEE_STRUCTURE_1701.pdf&ved=2ahUKEwjBsIKe44_eAhWJP48KHVMPDFwQFjAKegQIBRAB&usg=AOvVaw3BZq7DnEIOvDpHSSjNDfRj&cshid=1539858358986

Fee structure is different across all IITs for Msc Chemistry Program via JAM exam. 

Please ebe specific so we can share accurate details about the same. 

Fees per semester is generally between 20000 to 75000 rupees in General category for Msc Chemistry.