I believe it is definitely possible. Where I am a working student, school is a priority, but don’t get me wrong my work is very important too. They want me to get a good degree and do well in school, so they give me some time to get it done. It also depends on how heavy your school load is too because you don’t want to ware yourself out. I wish you best of luck and hope your position lets you have a study!
I highly doubt it, unless you're lucky and get into very flexible yard. However in most yards, working hours tend to be long and varied so it leaves little time to study. Depending on where you work, you may also be too exhausted to do anything by the end of your day.