How can I balance heavy weekly chemistry lab reports with my part-time job during midterms?

I am a sophomore biology major currently struggling to manage my time while working twenty hours a week. My chemistry professor requires detailed, multi-page lab reports due every Tuesday, which consistently overlaps with my busiest shifts at the campus library. I have tried using a standard weekly planner, but I still find myself rushing the data analysis late on Monday nights. What specific strategies can I use to break down these reports into manageable chunks throughout the week?