Well, it depends on the working hours if the working hours are long then I would advise you not to work. Initially, I too thought that it would be great to have some working experience. But, working as I have heard is very boring and taxing. Moreover, you have so many commitments to attend to such as ocip, nyaa, choir n your studies. But if you really need the money then can't be helped la. But, come to think about it our holidays are really short...
This is only my opinion, you have your choice. Hope that it helps.