Talk to your supervisor explaining your case, maybe after doing some homework regarding what you could get paid working part-time elsewhere, either to explain you can't afford to work part-time where you are now, or to just say given that temporarily, given that you are taking some classes, you will have to work part-time and resume full-time work later
I don't recommend changing jobs, maybe I'm wrong and it would be the best opportunity, sometimes changing everything works out for the best, but I think you will already have school as something new, you have a stable job [thougn maybe not if you go to part-time] in a currently shitty-assed economy, live in an expensive town. At least try that, but update your resume and do your other-jobs homework anyway.
If you're not going to have financial help when you start school, you'll have to deal with making enough then so until your hours are even funkier, I would say that being able to do what you can to survive and probably save or plan to save if you can, especially when working fulltime
I was going to say explain the rationale but you will probably do that anyway and anyway, you wanting to retrain for another job that you will eventually leave the current place for, will probably not help them want to help you more
I have had to drastically change hours and manage an increase in pay but my situation is different because my supervisor is in the same graduate program I'm in and it's training related to work, and I'm going back fulltime after graduating as I promised
The likelihood of your supervisor approving might also have to do with when you're taking off in relation to the busiest time on the job and their likelihood of finding someone else part-time until you're back or full-time instead of you
Ideas to save money when you go to part-time and pay tuition include - renting out your place in Hoboken for maybe 3 months to 6 months at a time and moving in with your brother if that's ok with you two, or moving to Jersey City with the same rental agreement, maybe consider with roomate/s in Jersey City [not where you live now though, I've been there, so I'm not suggesting that...]
