how to hack exam result

Ever had a bad exam which you know you could have aced if you gave it from the comforts of your room? or if you were allowed to cheat? 'Cause I have that feeling all the time. There was this exam I recently gave, for the exam we had to go to the center where the exam was being conducted everyone of us was allotted a PC where the web-page for the exam was already opened up in the browsers. We had to type in our credentials, login and then give our exams.