I don't care for that website. There are many websites that just focus on irony. Others focus on purpose and tone. Still others focus on irrelevant sentences. Do separate searches for each to find online practice tests.
Irony: deciding between dramatic, situational, and verbal.
Irrelevant sentences in a paragraph: which sentence does not match the others? I can tell you that the topic sentence is not an option.
Purpose of an author: is it to inform, persuade, or entertain? Look for media on Purpose and Tone.
The vocabulary come straight from the book. Good luck. I hope you score 100%.