You may be relying on part-time jobs to finance your way through university.
While the work may not be related to your degree, it can still provide you with necessary skills and experience sought by future employers. Some universities even offer accreditation for part-time work.
Why not consider a project scheme such as University Talent Projects (UTP), instead of basis part-time work?
University Talent recommends that full-time students work no more than 15 hours per week.