I'll give you what I got, but there's tons more out there!

Here's the one I liked best. (Though be advised that I know nothing about the representative from TX who's providing the site. I don't know anything about his politics and I'm not endorsing him in any way.) These are honest-to-goodness achievement tests with bubbles to fill in and everything. (Answer keys provided.) The site has tests for grade levels up to 11th grade, though not in all subjects:

http://scotthochberg.com/taas.html

Singapore Math has free placement tests, though sometimes the way they present stuff is a bit quirky, so it might require a bit more hands-on administering than with other tests:

http://www.singaporemath.com/Placement_Test_s/86.htm

There's a bunch of reading links on this site:

http://homeschooling.gomilpitas.com/articles/060899.htm

And here are their math links:

http://homeschooling.gomilpitas.com/weblinks/mathAssessment.htm

(BTW, I noticed that Saxon Math has a link to their placement test on this page.)

I found this stuff by just searching "free reading test." I came up with lots of stuff, some good, some utterly crummy. But it was free! I got what I needed from it. I'm sure you could do the same thing with other subjects or even with stuff like the SAT.

I hope this helps! Happy assessing! smile

Kriston