Many educators object to all the emphasis on test-taking, just as homeschoolers do. Test-driven courses seem to enhance short term memory rather than grasp of concepts. As soon as the questions are answered, the facts may be forgotten. But if a student has to know enough about a topic to deliver a 5-minute lecture, he retains the material. So perhaps there are more accurate ways to measure learning than through testing.
Some evaluations even enhance the learning process.
Test-taking is an ability in itself. Great scores on tests can be a measure of the ability to eliminate nonsense choices or other abilities that don't relate to proficiency. Poor scores can reflect test anxiety. If your child faces upcoming mandatory testing to satisfy state requirements, you might consider a brief test-taking orientation. After two years of trying to conduct homeschool like a miniature public school, I dropped virtually all testing.