Purchasing an ebook to boost your preparation is a great initiative! If your chapter-wise question paper ebook isn't opening, it's usually due to a few common technical issues like file corruption or software limitations.

Here’s the humanistic guidance:

1. Check for an Update: Ensure your PDF reader (like Adobe Reader or your browser) is updated.

2. Redownload: Try deleting the file and redownloading it from the source link in case of a corrupted file.

3. Use Support: If the issue persists, use the official Careers360 QnA discussion for direct technical help: https://www.careers360.com/question-how-to-open-this-ebook-this-ebook-is-not-opening . Your success is worth the fix!