Do you really need to know this for the real world? Yes.
Are you really going to do a full head to toe assessment on every single patient during every single shift? Ideally yes.
If you think the answer is no to the above two questions, you still definitely need to know how to do this for your nursing clinical in order to pass. With experience, it will come naturally to you.
By completing a full head to toe assessment, you will be able to address issues and come up with an action plan to correct the problems.
It is extremely difficult to comprehensive the concept purely from a textbook and to remember when you only have nursing clinical once or twice a week. Watch this head to toe nursing assessment video and get a visualization of how to perform a proper patient assessment.