The surface tension study materials are best followed in a sequential manner from top to bottom. However, you may want to skip from one concept to another after going through the "Overview of Basic Concepts" section.
Read the question for each section keeping in mind the above objectives and see the illustrations and diagrams carefully reading the caption for each.
You may want to attempt to solve the problems before looking at their solution.
You should be able to achieve a perfect score in the self assessment.