> 50% credit for 30min of work.

That speaks more for the simplicity of the courses of your university more than against my position. Are you really Swedish? I'm going to assume not. Engineering classes at Swedish universities typically don't give points that add up to a grade cutoff point. You might get an average grade of all projects and finals. The final exam is typically 5 hours long with 5-10 very difficult questions. In my CS program we had to work 60+ hours minimum a week, and classes often had 70%+ failure rates. This is not an environment where you can get a second job, and to my knowledge, none of my classmates or anyone I knew did so, except during summers.