hi,

see if you are asking about class 10th marks then you need to give the average percentage which is obtained by calculating all the mandatory subjects , like language, science, arts all of the subjects, now coming to 12th marks some of the colleges need best of five or best of  4 , however some of the exam like neet or jee main you need to mention physics chemistry mathematics/ biology marks separately. you may know that for nits and iits you need to have 75% marks (for general )in pcm in aggregate or if you are belongs to sc/st you need to have 65% marks in aggregate in pcm. so follow the information brochure and read carefully before filling the form.