Everyone needs to look at this link. It goes in depth how to improve our clan war wins. Just as SuperSiw mention about the placement of our CC and what donations need to be inside of it; this article also talks about how we should attack. I want to emphasize to not be a hero and try to hit the highest player. Keep in mind we need to get three stars!
And I want to really thank AllClash.com for this amazing article, along with many other articles!