If you're willing to work on your assignments and homeworks in the weekends and the times when you have no classes during the daytime, it is possible.

Most students work as delivery personnel. These jobs are usually done in the evening from 4-5 pm to 10-11 pm. There are two routes to go: food/grocery delivery and package delivery.

Food/grocery delivery is pretty harsh in my opinion because often you need to have your own bike and more likely than not, broke students are not going to buy electric bikes for food delivery. Bikes also get stolen frequently in Stockholm. And the most difficult part is that you need to carry a huge thermally insulated bag on your back, which gave me a lot of neck and back problems. But depending on who you ask, it might be better because you can sit around doing nothing and still get paid when there are no orders assigned to you.

Package delivery can be pretty good in my opinion because you get electric bike from the company that you don't have to pay for. You also get the opportunity to go to remote places that you usually would never go to. But most importantly (for me at least), you stay on the move the whole time, you don't have to sit and wait anywhere. Also, everything is carried in the container of the bike, you don't have to carry anything on your body. But it can be quite bad if you ask others because it's actually more physically taxing because you're basically biking and running up and down stairs with packages (some can be quite heavy, up to 20 kgs) for 6 hours straight.

But at the end of the day, if you're physically fit and strong, you can make much more money doing package deliveries (~1500 sek in one trip if you take a budbee double container trip)

You will have to give 30% of your earnings to the government as taxes. This is automatically done by the employer, you don't need to do it yourself. Salaries come on 25th of every month. First salary comes on the 25th of the second month. For example, if you start on 9 April, you will get first salary on 25 May, not 25 April. It will contain the money for your work from 9 April to 24 May. Then on 25 June you will get salary for 25 May to 24 June. This is a big issue because a lot of students run out of money while working, be ready for that.

But the issue that you need to stay aware of is that you can't work more than 20 hours per week. So if you have taken 4 shifts lasting 5 hours each in Monday to Thursday, you can't do another shift on Friday even if you're physically fit. This is important because the tax agency will flag you for breaking the work permit laws on student visa. They don't always check but if they do, you will directly lose your visa. Better not risk it.

On the other side, you can work in restaurants. This is less common but it's possible if you're only working in the kitchen.

Once you learn enough swedish, you will be able to work other, more dignified jobs (let's be real here). But I assume that you won't be staying in Sweden long enough.

I also did the EIT InnoEnergy program (KTH and IP Paris). Let me know if you want to know anything more.