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2. Origin of Calendars,
3. Basics of Calendars,
4. Introduction to Magic Squares,
5. Odd-order Magic Squares,
6. Even-order Magic Squares,
7. Magic Matrices in Calendars,
8. Prime Numbers,
9. Squares, Cubes and Cube Roots,
10. Numbers '9' and Digital Root,
11. Interesting Methods in Addition, Multiplication and Division,
12. Secret Code using Alphabets and Numbers,
13. Secret Code using Magic Squares,
14. Some Puzzles and their Concepts,
15. Puzzles to be Solved.