How can I plan part-time work so that it supports university life rather than controlling it?

First reserve enough time for classes, preparation and review, commuting, and sleep; then set a realistic work schedule and maximum number of hours. Prefer fixed shifts or a job that allows fewer hours before exams, and review the effect on your studies each week. If your grades or health begin to suffer, reduce your hours. Compare jobs not only by pay but also by commuting time and how often you may be called in unexpectedly, and revise the plan each term.