Hello Student

According to your information most possibly you are from 12 science candidate who has his chemistry, English, computer science and maths subjects. The marks in the final examination of 12th science will be added in the marksheet and English and computer theory marks will also be added in your marksheet and out of total 500 marks the percentage will be  computed. At the percentage computing is to some extent hazy. According to the information given in this answer which will be very helpful for your assessment of marks and percentage in the marksheet of 12th science exam.

This will help.