Has anyone seen 0% improvement (or score decline) after extensive prep course?

<p>On the contrary, I had a tutor for my SAT preparation and my scores did nothing but improve on my first practice test I got a 490 in math and a 510 in critical reading, and after my last SAT I got my scores all the way up to 700 math and 630 critical reading. So a tutor vastly improved my scores.</p>