To open a downloaded mock test book, follow these steps:

1. Check the File Format – Locate the file and see if it’s in PDF, EPUB, or another format.
2. Use the Right Software – Open PDF files with Adobe Reader, Foxit Reader, or a browser. EPUB files work with apps like Calibre or Google Play Books.
3. Extract if Compressed – If the file is in ZIP or RAR format, extract it using WinRAR or 7-Zip.
4. Ensure Compatibility – If the file doesn’t open, try using a different device or software.
5. Redownload if Corrupt – If the file is not opening, re-download it from the source.