Can you use iPad pro for online schooling?

I do believe that this is very possible.

You can access pages as well as many other useful apps in the app store. You can email assignments in if need be, and there is very little limit to the sites you can visit as well. So yes. This is an excellent tool for Online courses. In fact, I use my iPad for an online course.

You would need to test an ios device with the web site. Lot's of school site use legacy web infrastructure.

What online school are we talking about. Visit apple store and see.

Flash on the iPad and iPhone

Puffin

"Puffin Web Browser is a wicked fast Mobile Flash Browser. Once users experience the thrilling speed of Puffin, regular mobile Internet feels like torture. Puffin Free is the free version of the Puffin family and supports Adobe Flash over cloud during "off-peak hours" from 8AM to 4PM (subject to change without prior notice)"

Free:

https://itunes.apple.com/us/app/puffin-web-browser-free/id472937654?mt=8

Paid:

https://itunes.apple.com/us/app/puffin-web-browser/id406239138?mt=8

Photon Flash Player for iPad - Flash Video & Games plus Private Web Browser
https://itunes.apple.com/us/app/photon-flash-player-for-ipad/id430200224?mt=8

"java for iPad is now a reality! If you were ever wondering how to use java for iPad, now you can! With the Virtual-Browser for Firefox App, java for iPad is possible with one simple app download! Virtual-Browser for Firefox App opens up a wide variety of apps and games – like java for iPad – that you can use from your iPad"
http://www.virtualfirefox.com/java-for-ipad

By Splashtop Inc.
Flash Video Web Browser – Full Chrome, IE, Firefox, Safari Compatible
https://itunes.apple.com/us/app/flash-video-web-browser-full/id431331485?mt=8

VirtualBrowser for Firefox with Flash-browser, Java Player and Add-ons - iPhone Edition
https://itunes.apple.com/us/app/virtualbrowser-for-firefox/id609289360?mt=8