I got in physics-85, chemistry-70, maths-90, hindi- 80, English-79 , physical education-80. How's my percentage will make or count
Your percentage is simply addition of all scores obtained divided by total maximum score combined of all subjects.
For Engineering exams like Jee Main, 5 subjects are considered like PCM and English and one additional subject like Hindi for calculations of aggregate. So your 6th subject becomes additional subject.