First of all, you need to contact your tutor and college and explain your situation to them. They will help you make plans, help you understand your choices, and offer suggestions. This plan may include rescheduling your exams or re-taking several courses.
Secondly, you need to know your study visa. If you can't graduate within the stipulated time limit, you may need to apply for a visa extension. You can get more information about visa extension by contacting the international student affairs department of the school.
At the same time, you can also consider seeking support and advice. The Student Support Office of Manchester University will provide various services, including mental health support and career counseling. These resources will help you if you encounter difficulties or need help in your study.
Finally, please carefully evaluate your situation before you make any decision. See if you have done your best to overcome the difficulties and finish your studies, or you need more time to overcome them. Once you have made a decision, you need to take practical actions to realize it.
In short, if you are an undergraduate at Manchester University, you may feel depressed and confused if you fail to graduate. However, you can find out your visa situation, seek support and advice and find a suitable solution by contacting your tutor and college. The most important thing is that no matter what scheme you choose, you need to make a decision according to your own situation.