What is chemistry, is it easy? How can i study well chemistry? Do you use math?

Chemistry is the science of matter. It studies what matter is and how it reacts. You do use math in chemistry, but it isn't usually difficult math. Usually, mostly algebra to solve equations. I found chemistry pretty easy and enjoyed it, with the exception of organic chemistry. To get started and be prepared for chemistry, I would suggest being familiar with the structure of an atom and the periodic table of elements. You should learn that stuff in the course, but if you are already familiar with them, you will have a leg up.