Translation of "to flunk" into Spanish

I remember in high school, my math teacher told me I was going to flunk out.

Me acuerdo que en el instituto, mi profesor de matemáticas me dijo que iba a catear.

They flunked it in Florence, they cannot afford to flunk it again.

Fracasaron en Florencia, no pueden permitirse fracasar de nuevo.

Lot less than laying around, trying to figure out how long it would take to flunk out. Heh.

Mucho menos que tirado por ahí tratando de averiguar cuánto tiempo tomaría reprobar.