If you have the code but not the file, you can often find it through official educational portals:
Use images with a resolution of at least 300 dpi to avoid blurriness in the final PDF.
Ensure your document uses a single-page, portrait layout. For a standard book feel, maintain internal margins (gutters) of at least 0.63 inches for books under 500 pages.
Check the Librolandia website or your specific school's digital library portal. Many educational PDFs are accessible after logging in with a student or teacher ID.