That's a sad thought. But, it's understandable, if you don't have time to take care of the animal, there's no point in still keeping them. As much as it hurts for me to say this, schooling and jobs are more important then keeping animals. However, if there is any other way you can keep them, like for instance, reducing the number that you have to a few of them, then that's another option.
Do you know of anyone who's willing to look after them for you or help care for them? That could be another option until you get more time on your hands.
Either way, do what you think you'll be able to manage. Good luck!