I purchased this set last summer to prepare for the National Civil Service Exam. 【Past Exam Practice!】 ① Only one book, "Numerical Reasoning and Data Interpretation," has about two pages of notes written in pencil on the explanation pages. The others are unused. 【K Master】 "Numerical Reasoning" has notes written in pencil on the explanations. "Verbal Comprehension" has a 1cm mark with a highlighter on the edge of the page. The others are unused. 【Textbooks (White)】 About half of the books have notes written in pencil, mainly on the explanation pages. "Introduction to the Interview and Government Agency Visit Course for the Personnel Agency" has notes written in highlighter and ballpoint pen. About five books have marks with a highlighter on the spine, and one book has a mark on the edge of the page. I believe this is all the study material I purchased as a set. I disposed of the envelopes for submitting assignments. Please refer to the second and third images for the books without titles on the white textbook spines.