www.testprepreview.com then go to COMPASS practice and then to Self Assessment modules in algebra or advanced algebra.
www.4tests.com then go to the math usage logo (30 questions) and then click begin exam.
www.number2.com here you need to spend a few minutes and enroll they give you a password but if you forget like I did its not a big problem with them just click on forgot password and they send you a link to your e-mail.
(This one is a real doozy)