Today I failed the 70-680 exam with 615 points

Good thing I got a free retry! On the paper I got there are 2 fields that I failed, Configuring hardware and applications (failed miserably) and configuring network connectivity (almost passed).
How do they score the examn, if you fail 1 section then you're totally failed or how do they get to that number? Also, do you lose points when you're wrong?
Haven't scheduled the free retry yet but I'll be studying soon again, it expires in June!