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... the student has every incentive to do his/her best on the entire section either way-- because they have no real way of knowing whether or not section 2 is the experimental one, or if it was section 6 instead, if you see what I mean.
Yes, thank you. I found these links...

1) free downloadable SAT practice test provided by college board
http://sat.collegeboard.org/practice/

2) Wikipedia description, of the SAT "Structure" http://en.wikipedia.org/wiki/SAT
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SAT consists of three major sections: Critical Reading, Mathematics, and Writing. Each section receives a score on the scale of 200–800. All scores are multiples of 10. Total scores are calculated by adding up scores of the three sections. Each major section is divided into three parts. There are 10 sub-sections, including an additional 25-minute experimental or "equating" section that may be in any of the three major sections. The experimental section is used to normalize questions for future administrations of the SAT and does not count toward the final score.