Maybe you've seen this
already, but it has two sample topics for the analytical writing section. It also has graded responses, beginning on page 56. I haven't taken the test, so I can't give you any topics that have actually been assigned.
1. "Our declining environment may bring the people of the world together as no politician, philosopher, or war ever could. Environmental problems are global in scope and respect no nation's boundaries. Therefore, people are faced with the choice of unity and cooperation on the one hand or disunity and a common tragedy on the other."
2. "Both the development of technological tools and the uses to which humanity has put them have created modern civilizations in which loneliness is ever increasing."