What is the best way to memorize lines?

I love theatre and I'm into a lot of theatre at my school! The best method for me to memorize lines is to just write them down on a blank sheet of paper because writing things helps me remember them. Also, read over them right before you go to sleep and that might help too. Hope I helped, break a leg! :)

I had a similar problem like you when i was the role of Annie in the school musical Annie and i found there were three ways to memorise lines that i found easiest.

Firstly with simple sentences or lots of short lines i found reading the script over and over in my head and out loud was extremely helpful. Always read other peoples lines as well because remembering your line is one thing but you need to know when to come in.

Secondly, with long monologues or chunks of speech that are long, i found singing it or putting it to a tune was helpful because I found remembering music lines easier than acting lines. You could also remember certain keywords so if your stuck it would jog your memory.

Thirdly, with all parts of the speech i found it really helpful if i read it with another person or whilst performing whilst you were on stage with required movements and facial expressions.

Finally, with panic and stress i found these were quite helpful

Drinking lots of water

Keeping yourself preoccupied

Yoga

Giving yourself positive encouragement rather then negative.

I hope this helps :)