<p>There is such an obvious explanation: your son, because he’s spent hours upon hours practicing in the ‘workshops’, has gotten bored of the SAT. So he’s concentrating less and less hard each time he takes ANOTHER SAT practice test, which explains why his scores are going further and further down (and lack of concentration hurts the reading score the most because the passages are so boring to begin with, if you’re not fully concentrating, there’s no way you’ll do well).</p>
<p>Everything makes sense. His reading score is plummeting due to lack of concentration (and his lack of concentration his due to the fact that you’ve made him take millions of practice tests). And because the reading score is the hardest to improve, what little this prep course did do to help his reading score is insignificant compared to the effects of lack of concentration. His math and english sections have stayed the same (or gone up slightly) because they’re easy to improve with prep. So his improvement from the prep course roughly cancels out his lack of concentration for those two sections.</p>
<p>In other words, give your son a break from the SAT for one or two months before he takes a real exam. He should break 2000 if you do this because his reading section will be back to par (assuming he concentrates after the long break from the SAT), and his math and english scores will improve slightly.</p>