<p>What kind of question is that?
Well, maybe you got lucky. IDK
Maybe your getting better.
Someone could perform a Stat test on this to prove significance, but I'm too lazy to.</p>
<p>Neither... it's KNOWLEDGE/EXPERIENCE (okay, maybe we can call it skill) ... a difference of 9 questions is a pretty big margin for luck if you ask me.</p>
<p>I'd say both. Not that I doubt your improvement was not wholly from your diligent and consistent hard work, but it's just that it seems like too big of an improvement to be skill alone. </p>
<p>So maybe you took a practice test that was easier or somehow easier to YOU, and you also had great concentration, and you mastered some new skills since the your April test. </p>
<p>But anyhow, don't let my opinions in any way take away from your rejoicing!
An improvement is an improvement.... no matter how you do it (well don't cheat lol).</p>