Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
You also go ahead to filter out CBT or PPT centres only by using the filter button on top of the page and selecting your preferred test type.
Source: https://www.legit.ng/education/1571263-the-step-by-step-registration-process-ielts-test/