Whether or not a college would rescind your admission for making a bad grade in a class you need to graduate depends on a number of factors, including the college's academic policies, the severity of the grade, and your overall academic record. Some colleges may be more lenient than others when it comes to grade forgiveness or academic probation, so it's important to check with your college's academic advisor or registrar to find out what their specific policies are.
If you are concerned about the possibility of your admission being rescinded, you should take steps to improve your academic performance as soon as possible. This may mean talking to your professors or TAs for help, attending tutoring or study sessions, or dropping a class if necessary. You should also consider talking to your academic advisor or counselor to discuss your options and develop a plan for improving your academic standing.
In some cases, colleges may be willing to work with students who are struggling academically. This may include providing academic support, allowing students to take a lighter course load, or offering extended deadlines for assignments. If you are struggling with your coursework, it's important to reach out for help as soon as possible to prevent your grades from slipping further.