First thing you should know is that you don't need to get 80% of all the questions right. Nope. It does not work that way!! CSC has a quota!! ..which is 8-12% of the takers would only pass the exam!! Believe it or not, you will be ranked based on your score. The first 10% will get the 80++ ratings, regardless of their scores, percent weight of each category. In our time, the top one got an 89 rating.
Here is a photocopy of my certificate as an example.
The exam is divided into 4 categories, Verbal, Analytical, Numerical and General Information.
I was quite sure I failed the exam because of the verbal usage part, I got 83.72%, which is quite shocking for me at first (since I did not know the score system then) because I'm sure I only got less than 50% correct of the verbal usage exam. It was that difficult! But because the system ranked my score highest to lowest, I got the 83.72% score. I was pretty confident with the analytic and numerical exams though (since this is my thing), I got very good scores while I was practicing on the reviewers. If you noticed I failed in general info, the questions was about laws and constitution and I sucked at it. I barely survived my Political Science and History in college. hehe.
I know this fact and I'm sure about it because it is the same with PRC board exams. They use the same system in Electrical Engineering Board exam, they use the quota system.
By the way, that ID there is the picture I submitted to the Civil Service Commission when I applied for the exam. It was taken from a 3.2 MP point and shoot camera. I photoshopped it, cropped, removed the background and added a name to it. Yes, you can edit your own ID, no need to go to photo shops to get your ID done for 100 pesos. My only expense in the ID is 7 pesos for one 3R photo. I'll try to blog the process here if I have time.
When you get your own certificate of eligibility, you have the option to change your picture with the same format, which will be permanently attached to your certificate because the Civil Service dry seal will be pressed on your picture..