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Khan Academy offers free resources and practice tests to help students prepare for the digital SAT.

Probability and Statistics - Khan Academy

Maths. Science. Economics and Finance. Computing. Test Prep. Arts and Humanities. Try Now, it's 100% free. Easy to use and 100% free forever. 10,000+ videos in math and science . Interactive lessons and quizzes. All topics aligned to Indian curriculum . Students speak. I was very weak at Maths.

Basic Geometry - Khan Academy

Learn about complex numbers and their real and imaginary parts on Khan Academy.

Prepare for the SAT Math section with advanced and harder math topics on Khan Academy.