I think the most important ones for me were the ncees practice exam and this one here:
You can use the free Kindle trial to access it free. The author also has a 2nd exam also available on Kindle.
The problems on the first half of the exam were slightly Harder than the ncees practice exam. The second half was pretty even with the practice exam. I found this test here to be pretty good in terms of difficulty. There are 2 books and they are available on Kindle (you can do a month free trial).