Focus Gold (Focus Gold) This is a set of Mathematics IIB 4th Edition textbook and answer key. As shown in the photos, there are some circled areas in pencil from when I was working on the exercises. There are no calculations or answers written in, so it won't interfere with your studies. While there is some wear and tear, there are no missing pages, tears, or major stains. I have checked it carefully, but as it is a used item, there may be some minor oversights. Please understand this before purchasing.