What is the format of the SAT test?

The SAT is a 3¾-hour exam, divided into 10 sections - three Writing Sections, three Critical Reading sections, three Math sections, plus an experimental section:
writing skills - 1 question
time: 25 minutes
1 essay
mathematics - 20 questions
time: 25 minutes
20 standard multiple-choice
critical reading - 24 questions
time: 25 minutes
8 sentence completion
4 reading comprehension (2 short passages)
12 reading comprehension ( long passage)
writing skills - 35 questions
time: 25 minutes
11 improving sentences
18 identifying sentence error
6 improving paragraph
mathematics - 18 questions
time: 25 minutes
8 standard multiple-choice
10 grid-ins
critical reading - 24 questions
time: 25 minutes
5 sentence completion
4 reading comprehension (paired short passages)
15 reading comprehension ( 2 long passages)
mathematics - 16 questions
time: 20 minutes
16 standard multiple-choice
critical reading - 19 questions
time: 20 minutes
6 sentence completion
13 reading comprehension ( paired long passages)
writing skills - 14 questions
time: 10 minutes
14 improving sentences
Although the new SAT test consists of ten sections, your scores are based on only nine of them. There are six 25-minute sections (three writing skills, three math and three critical reading), two 20-minute sections (one math and one critical reading), and one 10-minute writing skills. The tenth section is another 25-minute section in any of the three question types. It is commonly referred to as the "experimental" section and used to test out new questions for future exams. However, because this extra section is identical in format to one of the other sections, there is no way to know which section is the experimental one, and so you must do your best on every section of the SAT test.

There are four types of questions in the writing skills portion of the SAT test. There are two types of questions on the critical reading portion of the SAT test. There are two types of questions on the mathematics portion of the SAT.

How is the SAT test scored?

You will receive three separate scores based on the familiar 200-800 scale for each of the exam sections: critical reading, math, and writing. The score for the new writing section will be derived from two subscores: one based on a multiple-choice score of 20-80 and another on an essay score of 2-12. The essay will be graded independantly by two readers in about two minutes, reading it very quickly to judge it as a whole. (The College Board calls thisa process holistic scoring.) Each reader will assign a score of 1 to 6, with 6 being the highest possible score. The two scores will then be combined giving you a total essay score of 2-12.
To see what the test-makers say about what characteristics distinguish essays at the various scoring levels, Click Here.