Hello, this is Zeromini. Regarding the preparation for IT positions at public enterprises as of May 2026,
Regarding the textbook, I previously recommended 'Jian Edu Computer Fundamentals,' but as that book is currently out of print,
Please choose one of the two options to proceed with your studies.
Park Mi-jin Computer General Grade 9: The content is somewhat condensed and summarized, so you should study broadly with the mindset of creating a "single-volume" summary (not by referring to other textbooks, but by adding additional information through methods like Googling) as you learn. (The basic textbook is sufficient for this purpose.)
Jian Edu Computer General Used Book: In the case of Jian Edu Computer General, it contains a lot of content, so it is possible to pass sufficiently with this textbook alone. If possible, it would be good to purchase a used book for your studies.
The Jian Edu Computer General textbook has been discontinued and is now divided into detailed sub-subjects. While most content is covered within the 9th-grade Computer General secondhand books, those who feel uneasy can achieve perfect preparation by purchasing Software Engineering, Database Theory, Data Structures, Information Security, and Post Office 9th-grade Computer General, then studying the Post Office 9th-grade Computer General along with the detailed subjects.