Usually fall is the best time for students to take SAT test as admission deadlines are looming.
Upcoming SAT dates are Oct 1, Nov 5, Dec 3 and Jan 28, Mar 10 and so on in the year 2012.
Make sure you check the requirements of the schools/colleges you are applying to. If they need you to show off your advanced mathematical skills then you are better off taking SAT subject test Level 1 and/or Level 2 in addition to SAT test.
SAT registration costs $49 and Subject test registration cost additional $22 dollars or so.
As you have guessed subject tests Level 1 and Level 2 contains more advanced questions than what you will face on the regular math section of SAT test.
Level1 and Level2 content overlaps quite a lot but differs in following areas (as taken from Collegeboard.com website)
1. Numbers and Operations: Level 1 covers the arithmetic of complex numbers, but Level 2 also covers graphical and other properties of complex numbers. Level 2 also includes series and vectors
2. Algebra and Functions:Level 1 contains mainly algebraic equations and functions, whereas Level 2 also contains more advanced equations and functions, such as exponential, logarithmic and trigonometric.
3. Geometry and Measurement. Both Level 1 and Level 2 include mean, median, mode, range, interquartile range, data interpretation and probability. Level 2 also includes standard deviation. Both include least-squares linear regression, but Level 2 also includes quadratic and exponential regression. A significant percentage of the questions on Level 1 is devoted to plane Euclidean geometry and measurement, which is not tested directly on Level 2. On Level 2, the concepts learned in plane geometry are applied in the questions on coordinate geometry and three-dimensional geometry. The trigonometry questions on Level 1 are primarily limited to right triangle trigonometry (sine, cosine, tangent) and the fundamental relationships among the trigonometric ratios. Level 2 includes questions about ellipses, hyperbolas, polar coordinates and coordinates in three dimensions. The trigonometry questions on Level 2 place more emphasis on the properties and graphs of trigonometric functions, the inverse trigonometric functions, trigonometric equations and identities, and the laws of sines and cosines.
4. Data Analysis, Statistics and Probability. Both Level 1 and Level 2 include mean, median, mode, range, interquartile range, data interpretation and probability. Level 2 also includes standard deviation. Both include least-squares linear regression, but Level 2 also includes quadratic and exponential regression.
It might all seem overwhelming at first, but with correct preparation/tips/tricks and cool head one can easily crack the math exams and get score > 740. I have immense experience personally with TOEFL, GRE and GMAT exams and have score really good in Math sections. My tutoring goal is to teach you these tips/techniques where you wont even have to use your calculator and achieve score of your dreams. Looking forward to connect with new students.