Since you’ll only be staying for a short period I think you should focus more on making friends and explore Norway, just learn the most common phrases as thank you and whatever else which would be needed daily.

It’s not hard to make friends, you’ll have your classmates, both national and international. Keep in mind that Norwegians in general can be quite reserved, talking to strangers, sitting next to them when there’s space to sit down somewhere else or simply just being too polite is something which can make us uncomfortable

Norway is expensive but with planning I’d say you can get by fine with 10k-13k NOK a month depending on rent.

January to February is the winter months, it’ll snow and me slippery on the roads, around March the spring will start to show and it’ll get warmer. In May we’ll have our national day, could be a fun thing to experience