My advice is just to practice, practice, practice!!! Math has always been my weakest subject as well. I am just now taking clinical math, which is a prereq at my school before you can begin clinicals. I am taking in online, so most of the calculations I have had to teach myself. We only have two tests the midterm and the final. I had to learn the first 20 chapters for the midterm, and I scored an 86%. I was really happy with that, considering I was so nervous I almost vomited! lol I still have a while before I begin clinicals, so I have time to practice. I know how scary it is thinking that you are horrible in math, but if I can do it, so can you! Just keep studying, and practicing, and things will work themselves out!! Best wishes always!!