All four books are from the 2023 edition. I passed with this text on the first try. There are a few notes written in the margins of the textbooks. There are also wrinkles and folds. The question-and-answer book has markings in red pen and circles in pencil. The question-and-answer book has wrinkles, folds, and stains. The problem book has small scratches and stains, and folds. There are circles marked in pencil. The question-and-answer book shows the most wear, but it's still perfectly usable as a reference book, so I recommend it to anyone looking for one. None of the four books have red sheets. Please refrain from purchasing if you are sensitive to imperfections or are detail-oriented.