Hi there!
Sorry to hear you're struggling with your course!
I'd recommend talking to your personal tutor about your coursemates not co-operating- you might not be the only person struggling with this! Often the first month or so of uni can be difficult for group work, when people are still getting to know each other, and learning how to work together.
For your maths test, have you looked at whether the uni offers tutoring or academic mentoring? If it's the tests you're struggling with, a mentor can be really helpful to improve your exam technique! If it's the course content, see when your academics have office hours, and book in a slot with them to go over any topics you're struggling with.
Uni can be a big step up from sixth form/college, and I remember struggling in my first few exams too! The important thing is to not beat yourself up too much- you've still got plenty of time to learn and improve!
Wishing you all the best in the future!
-Ella
Graduate Advocate