A workbook is provided for the study of preparing not only an expected answer from a given problem but also an expected problem from a given answer. This workbook comprises a first page provided with a problem section and an adjacent expected answer guide section, adjacent to each other, a transparent second page superimposable upon the first page, and an opaque sheet adapted to be inserted between the first and second pages. The second page is provided with an answer section, and an expected problem guide section both of which are respectively located at corresponding positions above the expected answer guide section and the problem section when the second page is superimposed upon the first page.