Thanks just bought all 93. Took me less than 10 minutes to buy all of them.
No there is no shortcut but this is what I did to streamline the process without having to wait for each transaction.
Open the Play Store site on the desktop (using Chrome/Edge) and login to your Google account https://play.google.com/store/search?c=books&hl=en&q=jolly+p…
Press Ctrl+Click on the title of each book (you should do this 93 times). This will open a new tab for each book.
Switch to the first tab and click on the Free Book option to purchase it.
Now here is the trick. Don’t wait for it to load the second, instead press Ctrl+Tab to go to the next tab and Click again (you don’t need to move the mouse)
Repeat the above 93 times continously (one for each tab).>> Ctrl+Tab & Click
Go back to the first tab and Click to confirm the purchase and repeat 93 times>> Ctrl+Tab & Click
Tada You have all 93. Go check your email and you should have received 93 emails from Google Play for each free book you added to your library.
Now install the Google Play app on iOS Android or open the Google Play site in Chrome on any laptop, PC, Tablet and you can read the books.