Two-book set for common test information science preparation. Some parts were solved, so there were some writings, but they have been erased. There are small scratches on the cover. ⚪︎ About Programming Essence Photos 2 and 3 are of those pages. ⚪︎ About Information I Thorough Exercises Photos 4, 5, and 6 are of those pages. I wrote my name, so I have colored it with a marker or cut it out. With mark sheets. Thank you for looking.