IIT Kanpur - Indian Institute of Technology

After getting a call, the selection process would depend mostly on your GD-PI performance and since you seem to have decent academics in 10th,12th and graduation above 6 so chances could prove favorable for a conversion. So please give emphasis on your GD-PI preparation now.

You need to get rank under 1000 - 1500 to get admission in any of IITs.

Government institutions do not accept donations and especially IITs do not allocate seats based on donations.

The criteria for applying to IITs vary and for IIT-Kanpur, the criteria necessitate the candidate to have at least 85 percentile in CAT to apply for MBA.

Hey Ratan,
It's good that you are expecting this high percentage in Class 12th but you need to fill the application form of JEE Main in order to get admission in IIT because direct admissions don't take place in those institutions.
Once you qualify Mains you have to give JEE Advanced and according to the rank that you get, it will be decided whether you will get aerospace engineering in IITK or not.

You need to have 75% marks in JEE Mains.

The eligibility criteria for applying to the MBA programme at IIT, Kanpur is 85 percentile in CAT and above 60% in graduation and board exams. Given your profile, a call seems highly likely.