The Society for Editors and Proofreaders wonders if you are up to a challenge. To dispel the myth that anyone can be a proofreader (or an editor), the Society has specially created a proofreading test. Give it a whirl and see how you do. The test can be found at the Society’s website. Just click the proofreading test link in the “So you think you can proofread?” box. Or you can click this link to go directly to the test. Don’t worry — the results are private and I won’t ask how you did.
Via Rich Adin’s An American Editor blog