How to be more efficient with time?

Current Uni student bout to graduate. I tend to work in a way where I hyperfocus on one and grind it out until it's 100% complete, then move on to the next task. While I leave each task feeling like I produced a solid work product, the problem arises when I decide to take on like 5 different tasks at once where the 5th task doesn't get touched until everything else is finished, which could be several days. I also have somewhat spotty motivation to begin at times because I know once I start a project I need to leave with it being as done as I can get it in one sitting. Works in college but now I'm at a point where I feel I work too slow and waste a lot of time. How should I organize my stuff so that I can take on more projects at once?