Here is a set of free short videos for stepwise preparation of Coordinate Geometry on GMAT. For a more detailed treatment of the topic, you may want to opt for our GMAT online course or our GMAT test series of 15 mock tests.
The Coordinate Axis - A Primer
The Distance Between two Coordinates
Equation of a Line
Parallel and Perpendicular Lines on Coordinate Axis
Slope of a Straight Line
Equation of Circle on Coordinate Axis
Length of Perpendicular on Coordinate Axis