This article is useful for anyone who tutors the SAT, or for students who want to understand the test better. It discusses the new SAT math section in detail, and explains why some students may find it more difficult than the old test. It also discusses how College Board rushed to have it ready.
http://www.reuters.com/investigates/special-report/college-sat-redesign/
Verbal sections aren’t discussed in this article, but IMO, those sections are more difficult than in the old test, despite some simplification of the test.