In most cases you'll need a job offer to support your work visa - so your first task will be finding a job. Study in New Zealand. NZ Study + Work. If you plan to work while you study, you need to make sure that your visa allows you to work.
a hydrocarbon contains only hydrogen atoms and carbon atoms there are a large number of hydrocarbons but the simplest is ch4 methane one important thing about hydrocarbons is that they are all flammable
Petroleum is a mixture of a very large number of different hydrocarbons; the most commonly found molecules are alkanes (linear or branched), cycloalkanes, aromatic hydrocarbons, or more complicated chemicals like asphaltenes.