PSAT Scores different from Sophomore year to Junior year?

<p>Hey guys,</p>

<p>First post and the reason I'm posting is I'm a bit concerned about my PSAT scores (not that I'm in search of a scholarship or anything). The concern is caused mainly between the difference between my Sophomore actual PSAT scores and the practice PSAT test I just took as a junior at my home. My scores decreased significantly in two of the three subjects:</p>

<p>(Note I'm adjusting these scores so they are like SAT scores)</p>

<p>Verbal: 650 became a 610
Math: 580 became a 510 (?!?!?)
Writing: 580 became a 710</p>

<p>The issue I have with these scores is, after another year of math (Geometry) my score decreased by a whole 70 points? I don't understand how that can make sense? Also my vocabulary and basic understanding of English has decreased in a year? </p>

<p>Also, did I suddenly become better at writing or grammar? I don't think so, we didn't cover grammar my entire sophomore year. </p>

<p>Can anyone explain these results, to me they don't really make sense.
Thanks
-Street</p>