Are some tests in the BlueBook Easier than others?

<p>The First 1-3 tests I will score around 670-680 but on some tests I will like dip into the 620's and 630's, and this really confuses me because some questions get labeled as hard and really are not hard at all.</p>

<p>For all positive integers j and k, let j[R]k be defined as the whole number remainer when j is divided by k. If 13[r]k =2. what is the value of k?</p>

<p>k = 11. </p>

<p>At first when I saw this question I thought their was some kind of trick to it or some kind of curve ball, I said to my self " no way can a hard question #17 be that easy" but to my shock the answer was indeed 11. Anyone mind giving some advice on how someone can truly gauge himself in the SAT math?</p>

<p>Sometimes I feel like the difficulty wavers. But not by much. I read somewhere that the sat math has an consistency level of like ~0.9 (1 being the exact same difficulty each time)</p>