The numbers mentioned during the discussion of the problems will only be changed but the presentation of the problem will remain the same. The purpose of this kind of examination is to encourage students to study. I noticed that students who doesn't get good or passing  scores after an examination are discouraged from studying for the next exams. My theory is that if the students are compensated from studying, they will study for the next exams. For me, studying is a skill, the more you study, the more you learn, the faster you learn, the more skillful you are in studying, the better scores you get. A question which was not discussed or a twist of the discussions would only appear in an exam as a bonus point. It will be the choice of a student whether they are going to answer this question or not. The scores obtained in this question is not a part of the total perfect score of the exam, it will only be added to get the general average at the end of the term, period, or semester, or the Google Grading System. This is simply administrated so as not to bore the more intelligent students who likes studying in advance and more in-depth; this is just done to boast their egos of getting the highest scores in their class. Because my theory is that in this kind of exam, the average and intelligent students would tend to get about equal scores, which would be so annoying to the latter. 

            If a pupil or student knows exactly what is going to come out in the exams, my theory is that, he is going to study even if he's not the intelligent type. In the future you can go to Google Training Centers, Schools, Colleges, and Universities, applying this method of conducting an exam, and be prepared and maybe even excited to take an exam and feel proud when you get your tests results. And who knows your parents would be proud of you, when you get your impressive grades through the Google Grading System. I hope this Google article is helpful to you......