Method one: Read out loud sentence by sentence, do not go onto the next sentence until you can repeat the previous one 5 times without looking back at your sheet or failing.
Method 2: Record yourself speaking the text, listen to it whenever you have spare time; during breakfast, before bed, while brushing teeth, in the car etc..
Method 3Write it out on paper or post-it notes with each sentence seperately, if written on paper then cut the sentences out seperately then stick them onto the wall in order vertically(see next page)
After sticking the pieces of paper or post it notes vertically, begin by reading the first one until you have memorized it, then continue on to the next one.
Method 4: find a partner to hold the paper, begin trying to remember the text and asking your partner to confirm after each sentence (this method is usefull for revision rather than learning)
Method 5: (this one is weird but works well) find a instrumental beat or song and make the words fit into the tune, eventually after a few goes the song will get stuck into your head.