Khan Academy
Khan Academy: Praxis Core Math: Algebraic Word Problems Worked Example
Sal Khan works through an algebraic word problem question from the Praxis Core Math test. [4:19]
Khan Academy
Khan Academy: Mcat: Biomolecules: Evolution and Population Dynamics: Alternative Selection
Learn about driving forces of evolution other than natural selection. Group selection and artificial selection are just a few of these forms of 'Alternative Selection.' [4:34]
Khan Academy
Khan Academy: Praxis Core Math: Algebraic Properties Worked Example
Sal Khan works through a question on algebraic properties from the Praxis Core Math test. [5:45]
Khan Academy
Khan Academy: Linear Equation Word Problems Basic Example
Watch Sal work through a basic Linear equations word problem.
Bozeman Science
Bozeman Science: Ap Biology Test: User Guide
Mr. Andersen describes the two portions of the AP Biology Test. Tips for answering multiple choice and free response questions are included. Sample questions from old AP tests are also included. [14:47]