Which ‘English Accent’ should I follow, so that I can understand the audios used in the test?
You won’t have to follow the accent of any particular country, rather you should follow ‘International English’ accent. As the IELTS has its’ presence in most of the major English speaking countries, three main varieties of English are used in the test, they are 1) British English, 2) Australian English and 3) American English. Apart from that different ‘Regional Forms of the English Language’, of the UK are also used. If you get habituated in listening ‘International English’ (From TV News, TV Debate Shows, etc.) you won’t have to face many difficulties in understanding the audios.