Here is the link to the playlist of videos that explain all of the math questions in the 2017 PSAT Saturday test that was conducted on the 14th of October: 2017 PSAT Saturday Test Video Explanations.
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2017 October SAT Test: Video explanations
Here is the link to the playlist of videos that explain all of the math questions in the 2017 October SAT Question and Answer Service test. The playlists are separated by sections. Section 3 of the math section does not allow use of calculator, whereas the calculator is permitted in Section 4 of the math section.