1. Prioritization
In life, it's difficult to find time to do all the things you want to do. In college, it's even more difficult, as you have to balance your responsibilities with your extracurricular activities. Therefore, prioritization is key to making the most out of each day. To be the most productive, you must determine which activities are most crucial to your success (or which has the closest deadline) and finish them first. This way, once you've eaten the frog, so to speak, you can move on to other tasks without having something loom over you.
2. Discipline
Once you sort out your priorities, however, you must find it within yourself to finish your tasks. Prioritization is extremely important, but it will have no impact if you do not have the discipline to take action. Tip: discipline is often used interchangeably as motivation... but they're not the same thing. With motivation, there is a higher power compelling you to do something. With discipline, you yourself are forcing productive work.
3. Constant growth
The other day, while I was starting a new book, I realized my goal should be to learn from it as I read rather than finish it. In college, everyone is always working towards the future, whether it be the summer or graduation. However, I would argue that the most important thing is not graduating, but learning throughout the 4 (or more years). Everything is a process, and as long as you make an effort to constantly grow, you will reach your goals in the end.