Some parents prefer to test yearly, some prefer portfolio assessments, some prefer tests every two or three years. There is no one right answer, but as a parent, you know your child best, and you will be able to tell when he or she is having a difficult time with a subject and needs more time to complete the tasks, more assistance, or a change in curriculum or methods. Relax and don’t over-pressure yourself or your child. A child’s desire and ability to learn is so ingrained, that most parents find assessments to be not nearly as fearsome as they first imagined.
Some curriculum offers more frequent assessments, even self-assessments, so the child can gauge their own performance. If you feel unsure about assessments, choose a curriculum that offers more structured assessments, but don’t feel bound to this, if later on, you want to try a more creative approach. You’ll hit upon the right approach for your family.