Many other skills at work are indirectly related to non engineering skills. In order to sell a project you may have to small talk to a non engineering manager about stuff THEY are interested in before asking for the money for a project. This means stuff that exists in the outside world. Besides if you already knew what you needed to learn you wouldn't need to be here at school. Read read read.
Every great engineer has a thorough understanding of how the world works by reading voraciously.
Many magazine articles do a much better job explaining things than text books. Sometimes you see new uses for things presented in school that the text books don't cover. Creativity is taking two or more previously unrelated things and combining them into new and novel uses. Studying all the time is really a pain and its easier to pick up a book for twenty minutes at a time than trying to watch a movie that way. Learn to build an fly RC aircraft.