score fluctuations during practice tests?

<p>When doing practice tests, sometimes my score fluctuates. Sometimes I hit above 2200, sometimes it just lingers around 2000. It gets kinda frustrating at times.</p>

<p>Anyone had a smiliar experience? Oh and I just form a rough score using the typical curves like </p>

<p>Math 800 = -0</p>

<p>CR 800 = -2</p>

<p>Writing 800 = -1/12 essay</p>

<p>^
In about half the cases, -2/12 essay is 800</p>