Fellow UMich grad here. Shapiro library (formal name for UgLi) was always a great place to study because you had plenty of noise isolation from other people, especially the upper floors.

On North Campus, CS majors had two major study spaces: the Beyster computer lab/atrium, and the Duderstadt Library. Course staff would provide office hours in Beyster, and if you wanted to study in a more collaborative environment, that was the place to be. Duderstadt had a mix of collaborative spaces (in closed rooms) and quiet workspaces (the benches near the stacks). I studied in both locations, depending on my needs at the time. Was a pretty effective setup.