Can I still do well on the SAT?

Gahhh, I'm so nervous. I'm going to be a senior this year, taking the SAT in October. Yeah, I know, I'm kicking myself for not doing it junior year. I took the PSAT last year, and I got a 165 on it (so it'd be like 1650 on the regular SAT), but I honestly didn't study. I think I looked at the practice book for about 15 minutes. I think that I could've done better, but I ended up leaving a lot of answers blank because I was short on time (my fault for not practicing). Based on that, do you think that I have a good chance of scoring 2000 or higher on my October SAT? I plan on getting an SAT prep book ASAP and studying, I'm just nervous. :/