...for what may lead to a life altering association!
Here is a set of free short videos for stepwise preparation of Alligation 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.
Alligation - When and How to Use
Application of Alligation on a Question
Two High Difficulty Mixtures Alligation Questions