Your examination result is available in StudentWeb (under the menu item "Your status")
I recommend you to also read the description of UiO's grading system
You can ask for an explanation of the grade which have been awarded, and you can appeal against your grade or any formal errors relating to the examination. Request for explanation of the grade must be sent to studentinfo@sum.uio.no no later than one week after the grade was announced. Please read more on UiO's information websites on explanation (http://www.uio.no/english/studies/admin/examinations/explanation/) and/or appeals (http://www.uio.no/english/studies/admin/examinations/appeal/) .