I took the book (I can't remember which one) and made my own flash cards/study guides.  I'm thinking about the thin book that has the three dimensional drawings with the little circles near each defect identifying them.  It's the book that shows a dozen different types of cracks on the drawings, and detailed definitions.  It’s green and a very good book.

I photo copied the drawings and used white out to cover the answers.  I read the book and answered as many as I could. 

I borrowed calibrators, micrometers, and weld gauges worked on using them.  I studied converting measurements SI into metric and vice versa.

Also, I thought I seen somewhere where you could buy the plastic replicas.  I didn't buy them, but keep defective photos and samples when I can.

Good Luck,

Keith