PSAT scores. (10 points.)?

Okay, so I'm a junior and I just recently got my PSAT scores back. I'm a little bit disappointed...I don't think I did too swell. I got a 54 in critical reading, a 52 in Mathematics, and a 57 on writing. My selection index is 163 and my percentile is 74. I'm pretty smart I would say but I don't think these scores are reflecting that. I've taken IQ tests (which I know isn't saying much) and score around 150. When I get ready to apply for colleges and they see a score similar to this on the SAT but they see my GPA is above a 4.0 and that's with all college level courses, will they still accept me? I'm not planning on going anywhere fancy like Harvard or Cornell, just a state college. After taking the PSAT by how much are you expected to improve when it comes time to take the SAT? Thanks in advance for the answers. (: