Hi Sathvik!
The SAT is offered in the months of January, May, June, October, November and December. It is 3 hrs duration and 50 min more if essay(option) is taken. No points are deducted for wrong answers. The questions come from practical world, directly related to work in college life and career. SAT scores are valid for five years. On an average, a score of 500 on critical reading and writing and 500 on mathematics is said to be good among half of candidates.

     Component                   Time Allotted (min.)    Number of Questions/Tasks

1    Reading                        65                             52

2    Writing and Language    35                             44

3    Math (No Calculator)      25                             20

4    Math (Calculator)           55                             38

5    Essay (optional)             50                             1     

      Total                           180(230 inclu essay)   154(155 inclu essay)

I hope it helps. Good luck!