SGF, Supreme Grumble Framer
1. No, your score is tallied from your correct answers. So, rather than passing over some questions, you would be better off guessing.
2. I'm pretty sure that would be 100%.
3. There are 150 questions on each CPF exam, selected randomly from a pool of many more. I don't know what the minimum passing score is, but I guess it is probably more than 70%.
If it is a negatively scored test, the number of questions answered becomes the base. ie if there are 150 questions and I answer all 150 but only get 75 right, my percentage is 50%. But if I only answer 75 and I get 60 right my percentage is 80%.
That is why I asked (albeit wrongly) what is total score possible. I should have asked how many questions are on the test.