Followup

Sir I am watching all your lectures and following your notes but I just have 1 confusion which I want to ask from you that

For therotical/descriptive topics e.g major characteristics that distinguish service from manufacturing, phases of product life cycle, maximizing return over product life cycle, ways to reduce cost gap, advantages and disadvantages of full cost plus and marginal cost plus pricing, issues to consider while outsourcing , advantages of zero based budget , advantages of rolling budget etc etc etc, whether we read and learn these topics from studytext OR from examiner reports answers OR from open-tuition notes , But all 3 are correct na?