Study is important as well as working, in situation where you have no helper and need to take care of bills and still try to graduate with good grades these two are although stressful yet achievable.
Working and studying can be tough but then it can make you more experienced and employable after graduation.
However these two can clash if you don't know how to strike a balance they both require self discipline and determination.
While at school I worked with different organizations and firms these enable me gain more experience in my field of study and the outside world (corporate world).
I needed to work part-time to assist in getting some of my provisions, pocket money and get some handout. It once affected my grades in year one but as time goes on I was able strike a balance.
I never miss any lectures , I make sure to be on time and participate in all the classes these was really helpful because my grades smile back at me. I completed all my test and submitted my assignment before deadline.
Being able to manage time is the secret to working and studying and it's a skill that will help you to concentrate your efforts on the most important thing.