Hey dear,

The role of different macro and micro nutrients are important for exam point of view as well as entrance examination point of view. No need to worry , you should prepare a list in which important role of different nutrients are written and you are not required to write all the nutrients , because There are certain elements and  nutrients only which are asked during exam ,so focus on them . You should Focus on role of zinc, magnesium, potassium, sodium, manganese, sulphur, calcium , and certain more macro nutrients which have prominent role in cells and cell processes. Hope this helps.

Good luck!