As for The Second Task in The Writing Section — there is no Organizational Structure. It is simply a statement of what you are to write about (with some options for you to choose).
.. As for The First Task in this Section. The Organizational Structure of The Reading Passage & Audio File will be one of the same structures that you will encounter in the previous Sections of The Exam. For example:
You won’t necessarily have to identify The Organizational Structures of The Reading Passage & Audio File in order to fulfill The Task. However — noticing which Structure is being used will certainly help you to be able to effectively formulate your Response.
(Now Let’s Get Into Into The Actual Reading Question- & Task-Types)