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Asks before it explains

You answer first, and say if it was a guess. The explanation comes after you commit.

Roediger & Karpicke (2006)

Explains the options

Explanations go through the options, so a wrong choice teaches as much as a right one.

Hattie & Timperley (2007)

Answers your why

Ask why an option is wrong. The chat stays on that question, for up to six turns.

Remembers you

Preps keeps a short note of what your answers show, and starts from it next time.

Brings it back

A missed or guessed question returns three sessions later, then five, then seven.

Cepeda et al. (2006)

Picks the next five

When a pattern shows in your answers, Preps offers five questions to check it.