Not every link is what it seems. Cybercriminals know students are desperate. They will create a fake Google Drive page that asks you to "Verify you are human" by downloading a .exe file or entering your credit card details. Once your device is infected, keyloggers can steal your semester project data or banking information.
The Kindle edition is often cheaper than the paperback. You can download the Kindle app on your laptop or phone and highlight/annotate the text.
Many engineering colleges have dedicated WhatsApp or Telegram groups where seniors share "Google Drive links" to textbook PDFs. This unofficial, peer-to-peer networking has made Google Drive the default repository for academic materials.
If you cannot afford the book:
Type the following into Google’s search bar:
"R P Jain" "Digital Electronics" filetype:pdf
Then, click "Tools" > "Any time" > "Past year" to filter recent, likely working links. Occasionally, Google will index a publicly shared Google Drive link. Look for URLs that begin with drive.google.com/file/d/...
While Google Drive itself is a secure platform, the shared links for "r p jain digital electronics pdf" come with significant risks.