Being busy studying doesn't mean you can't be active in organizations. Organizations can be carried out by every student as long as they are good at dividing their time between lectures and other activities. You can take part in one or even more organizational activities by dividing your time appropriately. This activity can be adapted to lectures, because after all lectures are still the main priority as a student. There is time for studying, doing assignments, attending organizational meetings, resting and refreshing so you don't get stressed.