Do you reuse flash cards or rewrite them?

[blackscholesvol]

I am band 10 fail and made a bunch of flash cards during my June 2015 preparation. I’m flipping through them and a lot of material have already faded. I generally study by doing problems and creating flash cards when I get a question wrong.

 

[S2000magician]

Write them, throw them away, repeat.
Two, three, four times or more.