We homeschool, but I can't say I know anything about Thinkwell. However, that entry test is so far off that it would make me think twice about using their stuff. It is at most an entry test for 4th, and it is missing some typical 3rd grade stuff.

Compare to the Singapore 3A exit test (middle or end of 3rd grade for an average student).

http://www.singaporemath.com/v/vspfiles/assets/images/pl_pm3atest.pdf