How to get consistency in SAT scores?

<p>So, when I took the SATs, I got a 740 W and a 570 CR. On the PSAT I got a 57 W and a 67 CR. I took the SAT pretty soon after the PSAT, so I didn't do a lot more studying in between. On practice tests I keep fluctuating as well. Is there any reason this is happening? Is there anyway that I can get consistency in my grades? And will it look bad if on the next SAT I flip-flop again, and have good CR scores but bad W scores?</p>