Important questions

There are 2 questions i want to ask ! ! 1. When we answer for exam questions, can we answer firstly, secondly, thirdly ? So itnlooks more organized ? Whether its for professional marks or not, just genereally for whole answers(of course not in bullet points). 2. When we answer the question, for example e-marketing 6Is (interactivity, integration.... etc) can i write one sentence from the study note and the other sentence from the scenario by applying it (to the one related to study note)? ? So for every paragraph has 2 sentences where one is from the study note and the other one is from the application to scenario Thank you ! ! !