Retelling exists as a noun. The sentence "Somebody retells the text" does not make sense.
Does this word exist? Somebody retells the text. What's the noun for this action?
He was retelling the text to remember ( to memorize) new words.Does this one make sense?
It only works if he was relating the text (story) to another person. If he was simply saying the words from the text aloud (in the way people learn a script), then he was "repeating" the text.
I associate "retelling" with telling a story to other people for the second (third, fourth) time.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.