Unless the admission offer came with a condition that you did not fulfill, then no.
If there was a condition that you “must maintain your previous academic performance” but your senior year grades were lower than previous grades, then you may be concerned. However, rescission is unlikely unless you earned a D or F grade, or your GPA dropped by a lot (e.g. 3.9 → 2.1).
Yes, as mentioned above, college courses often have fewer larger items of evaluation for grading than high school courses.