This way you and the teachers can see how much you know, and if you have to work harder. But you have to learn quite a lot before an exam. Depending on the school, you have to do more or less homework. In one case reported to me, children from a scientology school who transferred to a public school had to start over again from lower school levels. In many places there are other kinds of schools also, but almost all of them teach what will help you work and think for yourself and your family, and deal peacefully with many different kinds of people besides scientology members.
Life is full of surprises.
You have challenges all the time. You have to make your own decisions. You can do a lot, as long as you don't harm anyone else - because other people are also free. And yes, you make mistakes. Movies are movies.