The schools would have a lot of information about him. Where intelligence is concerned, it is impossible to fake smart without some kind of cheating. But it is easy to fake dumb. The skilled examiner can pick up clues that the subject may be faking, but there's nothing certain about this. With personality tests, many of the older simpler questionnaire type tests can be easily faked.
More recent tests have internal validity scales that help determine whether a person is faking.
Projective tests, such as the Rorschach, can indeed be faked, but whether the examiner can tell it or not is really a moot question. Afraid I can't give you much reassurance. The above paragraph was in response to the original e-mail which asked the same questions in the post. I had hoped for better. We still do it today.