Interesting article from US News and World Report.
They definitely recommend taking the SAT multiple times, mostly because it is a proven fact that students' scores improve on the second and third efforts.
Familiarity is a good thing when taking Multiple Choice tests.
http://www.usnews.com/education/blogs/college-admissions-playbook/2013/10/07/5-tips-for-designing-a-test-prep-timeline#!
