Question for LU students

I'm studying in LU, faculaty of Technology, 1st year. It appears the 1st year has a different system than the rest, but I don'tquite understand how. I mean I failed 3 courses out of 9 in the first term, but the added up gpa registered only the passed courses.

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My question is, does that apply to the second session? And is it better to just not do the exams I am not well prepared for than pass with a 50/100? And is it really that bad to leave some courses for next year?