The following are worked solutions for the questions in the math sections of the SAT Practice Tests found in the The Official SAT Study Guide Second Edition.
It would be best that you go through the SAT practice test questions in the Study Guide first and then look at the videos for the questions that you might need help in.
Questions: 1, 2, 3, 4, 5, 6
Questions 7, 8, 9, 10, 11, 12
Questions 13, 14, 15, 16
Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.