How low does your GPA second semester senior year have to be for the u to rescind your admission? senior slide is hitting hard, asking for a friend 
From https://admissions.tc.umn.edu/freshman/overview.html
Schedule changes and senior year performance:
We consider the application to be a contract between the student and the University, with the student agreeing to successfully complete senior year courses listed on the application, and achieve grades consistent with their academic performance through 11th grade.
In August, after final transcripts are received, we review each student’s senior year coursework and the grades earned in those courses to confirm course completion and that the performance during the senior year is consistent with the academic performance at the time of application. Unsuccessful completion of senior year coursework and/or a significant decline in academic performance during the senior year may result in the cancellation of admission.
Students considering making schedule changes, or those who are concerned about their academic progress in any of their courses, must consult with their U of M admissions counselor (1-800-752-1000 or 612-625-2008).