Question

In order to remember his lines for the play, guy repeats his lines over and over again. this process is called ________.

Answer 1

This process is called “rehearsal".
The practice is useful in memorizing and committing the information o memory especially for someone who is going to repeat the same lines on stage in a play or drama etc. Another kind of rehearsal is "elaborative rehearsal", which means relating the information acquired to already known information to remember it.