http://www.admissionsconsultants.com/college/sat.asp
some highlights:
Ascending order of difficulty
The SAT questions become more difficult as you go through each section. If you are nearing the end of a section and you can not figure out the last few questions, your time will be better spent to review the questions in the beginning and middle of the section. Keep in mind that all the questions are weighted the same. Furthermore, a few blank answers will not make a material impact on your score.
Avoid Random Guessing in the Multiple Choice Sections
The SAT's scoring formula has been "tweaked" to penalize you for incorrect answers. As a result, you will not be aided by random guessing. If you have no idea what the correct answer is to a question, we suggest that you simply skip it and move on. The only exception to this is the problem solving without multiple choice. There is no clue for guesses in this section, so it will behoove you to write down a number for each question.
It will be advantageous for you to guess, however, when you can eliminate at least one incorrect answer. Usually you will be able to identify at least one choice that is clearly wrong. Eliminating even one incorrect choice will improve your odds.
from my understanding most people do better the more they take it, so keep trying if your not happy. Usually colleges will accept your highest combined score.
oh, and spell your name right