I'm unfamiliar with the situation in SA but from what you have told us I think something has to give. If the school requires you to have a computer then why haven't they provided computing facilities ? Is there a library that allows access to a computer ? Do you really need one or is it simply useful to have ? Could you complete schooling without one then in a few years get a full time job and save up enough to get one to take evening courses with ? Perhaps the answer is to plan longer term.