You have read about IELTS exam procedure on some website and now understand all the details.
What do you still need to do?
Test conditions vary depending on different countries and test centers. The conditions also change over time, you need to confirm all the important details with the official sources any time you take the IELTS test.
Edited: 2/24/2020
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International English Language Testing System (IELTS)
It is an international standardised test of English language proficiency for non-native English language speakers. Probably, it is the most popular formal English test in the world.