If you are currently residing in Norway, I would recommend you to opt for any Norwegian courses. They are highly effective (I have many friends who spoke Norwegian fairly well after a few years of staying there). If you still are not resising in Norway, I would recommend you to try to read Norwegian news, blogs, watch Norwegian programs with also Norwegian sub-text. Or maybe Norwegian movies? Try to find something from online as well. Youtube for example could be a good source for you to learn how to pronounce Norwegian words. Dictionaries or reading Norwegian books can also improve your grammar as well. Try to write a diary of what you do everyday in Norwegian so people can help and correct you. Online courses is also a popular optional. Lykke til :)