The SCJA exam requires minimum knowledge of the UML Infrastructure and Superstructure specifications. Of the 14 UML diagram types, the class diagram is the only diagram type on the exam.
There is value in understanding UML diagrams and features that are outside the scope of this exam.
So in your independent research on UML, don’t ignore the other diagram types since this knowledge will surely come in handy later for you at work.
Clipping is a handy way to collect important slides you want to go back to later.