My advice would be to get it going on paper first and don't get too caught up with which system to start with. Since most undergraduates are also on a budget, try this idea of "GTD in a Box":

What you'll need:
5 Office Cardboard Boxes
A good supply of Hanging File folders
A good supply of 1/3 tab left manila folders
Dymo LetraTag labeler - just my preference because it's simple
Black Sharpie Pen
A good supply of 3x3 Post-It Notes

Four of the cardboard boxes serve as your "filing" system for GTD. Take the black Sharpie pen and mark each of the four boxes with letters - A-F, G-L, M-R, S-Z.
Fill each of those boxes with some blank hanging file folders; these will be what "hang" in the boxes to create your makeshift cardboard filing cabinets. Then use your Dymo labeler to label the manila folders and put them into the hanging file folders when you file stuff.

Next, take your remaining office cardboard box, take the lid off and use the lid as your desktop "Inbox" - everything starts there, gets defined there, and then moved to the appropriate place.

Then in the open box with the lid off (because it is being used as your Inbox), put some more hanging file folders and label the following manila folders to put into them:
Actionable
Waiting For
Read-Review
Agendas
Someday-Maybe
And behind those,
Manila folders with labels for each of the 12 months - this will serve as your "Tickler" system.

Then just keep some standard 8x11 ruled paper nearby and start collecting thoughts, ideas, projects, etc. into your new paper-based system. Drop them in your inbox, define them, put them in their appropriate place based on David Allen's questions - Is it actionable? Yes. What's the next action? Can I do it in less than two minutes? etc. If it is actionable/doable, write the context - @ Errands (Office Store) - and the next action - Purchase that Dymo LetraTag labeler, on a 3x3 Post-It Note, put it on the piece of paper, and then file it in the "Actionable" folder. If it's something you're waiting for, write "Waiting for?" and file that in your Waiting For folder, etc.

Once you get GTD going well on paper, then you can try out the digital solutions that you think will work best for you. This is how I started my own journey before finding, and eventually creating, my own digital setup.

And for an undergraduate, the cardboard box setup is easier to move around if you have to change dorms or move around alot.

Hope that helps.