Disclaimer: I took my exam in 2014 so I am not sure if this still applies to the present board exam.
Direct answer: 75% weighted general average from all the subjects
But, you should not get a grade lower than 60% in any subject.
Meaning: you can have at least 60% in 1-2 subjects given that you have an average of 75%.
However, if you got 75% on average and obtain less than 60% in any of the subject/s, you can take a removal examination ONCE for that subject/s.
Therefore, if the total number of questions in each subject is 100, you need to aim to get at least 60 questions answered correctly in each subject and an average of 75 points for all the subjects.
Below is a cropped image of my own examination results in 2014.
GOOD LUCK, TAKERS!
larswrites 