I am studying in one of the scandanavian countries but ive been to Oslo in Norway, its the same in all four countries. Living, food everything is very expensive even though tuition fee is free even for international students. The minimum u have to pay for 1 bedroom apartment is around 4300 NOK and then say 850 NOK for food( at least for me)450 NOK for travelling expense, with all the bills and stuffs, its around 6500 norwegian kroner. Its very difficult to get a qualified job or even simple Mc donald job for people without the knowlede of the language, but if u do land a job, u will earn a lot(the minimum u can make is around 10300). My advice for you is to study engineering or other IT fields where you have a higher chance to get a summer job, u can earn up to 20000, GOod luck!