help!! Any suggestions for me...???

<p>I took the December SAT and I thought I did pretty well,,, but I didn't..=((
Math: 680
Reading: 630
Writing: 600 (8 essay)</p>

<p>However, on PSAT, I got
Math: 720
Reading: 630
Writing: 680</p>

<p>So, I don't even know what happened in math and writing (especially!!!)...
Do you think it's even possible for me to get that in January?
Math: 760
Reading: 730
Writing: 740</p>

<p>And what should I do to get at least 2100+?? Any suggestions? or is this impossible??
because,, I'm pretty good at math and it's probably because I made stupid mistakes and I'm pretty good at writing, too (except the essay part).
Any honest/ helpful suggestions would be good!!!
Thanks!!
=((</p>