Killing time, well doesn’t sound good. But you can do join/learn things, which might help you in long term prospective. In fact I think you might be around 18 0r 20 year of age & learn something which relating to you professional career or any of those, which you would prefer to take as you hobbies/ interest.
Opting for a part time job sounds great, it would yield one in two, money & experience, but considering you age,……I think you shouldn’t opt that. But ye ultimatum, one fine day you have to work.