The S6 Lite is a great device, and 4GB RAM is enough for notes and regular browsing. Assuming your use case won't go beyond this, it should be enough to get you to graduation! 🎓🎓
However, I wouldn't call 4GB RAM "future proofed" - there will be times where you'll feel a bit of lag, especially when browsing with multiple windows, running multiple apps, or running really heavy apps (games, editing apps, etc.)
I would recommend the Galaxy Tab S8 if you want something to last you beyond graduation. (Get it here: http://spr.ly/TabS8-SM01
It's got 8GB of RAM, S Pen support, and lots of software updates waiting in the pipeline too!
Hopefully you make a choice soon! ♥