To calculate the percentage obtained in 12th, you must consider the total marks obtained in all subjects against the maximum marks. The percentage must then be rounded off to two decimal places.
So, 12th percentage= Marks Obtained / Maximum Marks * 100
For the graduation marks, the aggregate percentage must be calculated based on the university/ college norms. If no norms are established by the institute, you must calculate the percentage based on total marks obtained for all terms of the course.
In the case of a CGPA, the conversion to percentage will be made based on the guidelines of the institute awarding the same. In case no norms are established, the percentage will be calculated by dividing the candidate’s CGPA by the maximum possible CGPA and multiplying by 100.