Spacing works for me because I gain more information when I don't take it all in at once and spread it out.
By relearning certain things, it will stick with you better and you will most likely remember it the next time around.
Recognizing things helps everyone, if you recognize definitions then you will be able to know what word matches it during a test.
By being able to recall something, it helps you memorize more. Well atleast it helps me.
Chunking information helps me the most because it organizes words into sections and they all relate to one another.