Part time job

This fall I’ll be taking trigonometry (I’ve never taken trig before), two GE classes, and an intro to engineering class for a total of 14 credits. Im looking for a part-time job, ideally around 15-20 hours per week, and I’m wondering if that’s realistic. How did you balance work, classes, studying, and homework? In the spring my coursework will be heavier since I’ll be taking calculus, physics, chem, and other GEs