The Department of Public Instruction has posted samples of the reading, math, science, algebra, biology and English II exams that students will take this spring. The "released forms" -- presumably not the same questions students will see in May -- are designed to help teachers prepare their students for the tests.
You can try the new online testing for the high school exams. It took me quite a bit of clicking to get it to work (you have to make sure pop-ups aren't blocked), and when it did, the computer had the nerve to tell me I'd gotten the first English question wrong. Hmph!