I think choosing a pet with a short life expectancy is wise.
Many people take on a pet requiring more care than they can handle.
However, a parrot, which can live as long as ninety years, can be a good study partner. If you repeat facts enough to the bird that it learns to say them, it would be a sure bet you will remember them at test time. :-0
Rodents would be great, but every single one poops a lot. You would have to be replacing stinky wood chips every day.
I got my daughter a hamster when she was little, and it was very entertaining, BUT… it learned how to open it’s cage. The good side of that was, it told on itself. Everytime it escaped, it came straight to me to be congratulated.
You could get a chameleon.
Hermit crabs are pretty neat, but they grow, and you have to keep buying bigger shells for them.
I try to keep a praying mantis each summer. They live just a few months. But, I live where box elder bugs rule the warm months, and in droves search for a place to winter. A mantis keeps them from making themselves at home.
Fish are regular maintenance. If you have a great budget, an aquarium with filter and other necessities is less work than a thirty cent fish in a standard bowl. The sound of the filter hum is great white noise, but that same sound can knock you out during late study sessions.
I recommend a rubber duck. You can bring it gifts, make little outfits for it, and eventually get it a mate.
You can find rubber ducks on eBay in all kinds of sizes, styles, and colors. They range in size from ping pong ball to basketball.
You can construct a small apartment for it.
Whatever you decide, I applaud your forward thinking regarding your need for low maintenance. When choosing a pet, knowing one’s limitations is top priority.
Here are other things to consider
Roommate has allergies?
Pesticides used in dorms
Spring break, will you need a babysitter?