Step 1 – Find your nearest IELTS test location or take IELTS Online
There are more than 1,600 IELTS test locations in over 140 countries. Find your nearest test centre.
If you would prefer to take your test from the comfort of your home or another private location, you can now do so with IELTS Online, our online IELTS Academic test. Check you have everything you need to take IELTS Online.
Step 2 – Register for your IELTS test
You can register and pay online or download an application form to print, complete and submit to your chosen test centre.
You will need to provide a copy of your valid identity document. You will also need to present the same identity document on the day of your test.
Step 3 – Your IELTS test is booked
If you booked IELTS on paper or on computer, your test centre will send you an email confirming the date and time of your test once your application is processed. Your Speaking test may be scheduled for a different day, and your test centre will confirm that too. If you booked IELTS Online, you will receive an email confirming your test booking, and your Speaking test will usually be before your other test.
For further information, contact your local IELTS test centre or download our Information for Candidates booklet.
source : http://www.ielts.org/for-test-takers/how-to-register