If you feel strongly that you should get it remarked, then by all means go for it.
Also if you feel that it may have something to do with your lecturer's teachings, then next year see if you can get a different lecturer, switch classes.
By the way, is this for AS? Cause if it is I did Psychology Spec B, and last year in PYB1 I got an E, and then resat it this year and got full marks. So if it's an AS, definitely resit..I mean what harm is it going to do. You're going to have to go over the stuff at some point as a lot of A2 is synoptic.