I have a 2-Day event in 3 days and I need a little help with the dressage part. I have memorized my test and am working on perfecting it but I don't understand some stuff. I was reading up on tips on how to make your dressage better and they were talking bout the marking. What is the coefficent and the collective marks? Could someone explain in an easy to understand way how I'm going to get marked and what I really need to focus on to get good marks?