Many of these require only simple algebra. Do you have sufficient background in algebra?
Why would anyone want to take your exam for you? Even if you blame your troubles on your teacher?
It appears you managed #1. What was that one about?
Please seek psychological remedies for your math anxiety. Go find the book "Mindset: The New Psychology of Success", Carol Dweck. When you are ready to learn, rather than beat yourself up, reregister for the course and give it another go.