On Monday and Tuesday I linked to some practice materials from the official IELTS website, ielts.org. This is the best place to start looking for official practice materials online because all of the example questions there are 'real'.
ielts.org is a big website, and it's not easy to find the test samples, so here's a direct link to the page you need: click here. Just go down the page until you see the PDF links.
Of course, the other sources of 'real' test practice are the Cambridge IELTS books.