There are numerous free website that can help you to prepare tests if you do no have an online classroom management program that can produce tests.
I would suggest word processing your test questions first and then cutting and pasting so you do not loose it if something happens online. Also, carefully look at all the buttons before continuing to the next page of any program.
Easytestmaker allows you to create a test online and format it. You print it out for the students. The program produces an answer key to facilitate manual correction.
ProProfs.com allows you to create and administer the test online. You can have public or private tests. Your students see the correct answer for each question and your comment about the answer, if you included one. In the options, make sure to make it private if it is just for your class. You can have the students print out their pre-assessment total score and correct/incorrect response for each answer.
SchoolCandy allows you to create a test and administer it online. Students can see their results on individual questions only if the teacher enables this feature. Students receive their score as soon as they finish. There is a small statistical matrix to show questions with unusually high correct or incorrect answers. Tests are stored for one year plus 2 months. If teachers do not see the orange test screen, then students have left the site.
Zoomerang is an online survey site. However, you can also administer tests. You see the results of the class per question and can see how individuals responded to the test. Students cannot see their results. After 10 days you do not have access to the information unless you pay for the next level.
What other free test services do you use? What are the advantages and disadvantages of each?