This small course is a sample lesson of an important exercise for learning the irregular verbs of the English language. There is really only one way best for an ESL student to learn them and that is a combination of rote memorty (that is what this course is for) and practicing (speaking, reading, writing, etc.).
This course has been developed for you to create mental reference. Rather than depend on a piece of paper, a smartphone — or anything else outside of you — you will have these verbs available directly from your memory. That is better and faster than any book, paper, or gadget.