i was in Drama all throughout high school & i think i just kept saying the lines over and over again till i had them memorized. Or I would try to memorize the first line until i had it memorized, then move onto the 2nd line & try to repeat the first 2 lines, then move onto the 3rd, repeat the 3 lines, etc. does that make sense? lol.
Dunno how i managed to get almost all A's in drama cuz my teacher was intense, and tended to make the students in my class including me stressed as hell, but it was fun despite that part haha. i kinda miss those days.