A:
If your ebook textbooks are available for Nook (Barnes & Noble) or Kindle (Amazon), you could install those free apps and use them to read the textbooks. See if there is an app available that will work for reading the specific ebook textbooks you need. Then find out it the app is available for the type of tablet you are getting. There are other ebook reading apps available and I don't know all the ebook textbook vendors. Some may have proprietary apps that only run on one type of tablet.
The Nook and Kindle apps are available for Android, iPad and Windows tablets. I read ebooks on both apps using an Android tablet.