② Challenge 1st Grade October to March issues 6-book set of "What's That?" Discovery Books. 2018 Edition A booklet set for 1st graders. Includes knowledge, quizzes, and stories. Flip through them for 1st grade review. Also great for children who will be entering 1st grade soon! Most of the paper supplements are missing as they have been used. There are creases. Some have writing in them. I apologize if I missed anything. Due to shipping costs, I've divided it into 2 sets. It's more economical to purchase the two sets separately. Stored at home. These are used items that children have used. Please understand and consider before purchasing.