Admission rescind?

Hello everyone
I am a student studying in the CBSE curriculum in India. So I have been accepted to Purdue Engineering which was my safety and have applied to 15-17(including 3 ivy leagues, uva ,umich ,ucla, ucb, nyu etc.) schools more. I had a perfect gpa in class 10th. in 11th i had all A’s ( expect a B in physics) and for class 12th midterm i had all A’s as well.
Currently i am giving my board exams which started this month and and i feel that there could be a huge drop in my grades in these exams. The result of these exams will come by the end of May. Also i haven’t sent any predicted grades to the universities as they didn’t ask for them.
Firstly i wanted to ask that as the result will come end of may and we have to respond to universities by may 1 , will i have to submit these results as part of my final report
Is there a chance that my admission could get revoked if there is a drop in grades(c’s for example)???

following

I’ve heard that college generally don’t rescind acceptances, unless you have a very very poor performance in boards. I believe C’s would be equivalent to approx. 75-80%? In that case, I don’t think they would rescind your acceptance.

You’ll be fine. Most public non-california colleges don’t rescind applications unless there is a major issue with grades. Generally, just try to keep your weighted GPA above a 3.0 during senior year and you’ll have no problems.