My math mark sucks I know that I am getting a 58% at the moment. I'm still passing which is good since it has to be above 50 to pass but the final exam is in 2 weeks and it is worth 30% of your overall mark and I want to know if there is a possibility I can get my mark to be an 80 or even higher and if it is possible how well do I have to do on the exam?

Since you're struggling in math, let's make this a math assignment. If the final test is worth 30% of your mark, and you currently have a 58% average, what would your final mark be if you got 100% on the test?

If the final exam is in two weeks, isn't it a bit late to try to raise your grade? That should have been done earlier. Have you tried getting a tutor to help you through this course? I'd get one now to prepare you for the final. If you don't pass it, you may fail the course.