Many state education departments disagree with you. Testing is not mandated in many states, but instead use a portfolio of student work. If asked, the parent will submit this work along with records of attendance for review. Most states find that this works better and is actually cheaper than standardized testing, which has its own problems. It's usually very obvious if a child has not been in a learning environment. Standardized testing as a tool is over rated. Just look at how many public schools spend the weeks prior to tesing teaching directly to the test.
I disagree. I've gone through a public school system, where all students in the entire state sat for a series of closed book examinations that lasted over a 2 week period. The students are then judged by how they did amongst their peers in the entire state. They were no multiple choice questions. You either knew the subject matter or not. The higher school certificate examination (also used as the university entrance exam) took 2 years to prepare. This is not a case of quick rapid memorization to take a test to forget it an hour later. You had to demonstrate that you knew your stuff. But then, so did everybody else.