I'm not quite sure what you want if you don't want the answers. The answer to "How do I go about it?" is "You follow the instructions given and do as requested by the task".
I'm not being facetious, I just don't quite see how we can tell you how to do it. The idea of the CELTA is to find out what you know, and how well you know it or do it - not to test how we do things.