Construct validity refers to the actual measurements of the IELTS test, so covering the hearing test in the IELTS exam language quizzes and vocabulary quizzes, so also used many of the IELTS exam questions and select the type, so you can accurately and objectively measure the extent of testing, can accurately measure the language ability of candidates.
Content validity is the IELTS testing agencies and experts and scholars to analyze the questions in order for global English-language tests as efficient language test, also from different physical validated to the highest standards in terms of content validity, use language objectives had been reached.