Student or Learner
I cut an apple into slices and put in her box to let her bring to school.
Then I tell her, "I got bring you an apple. Remember to eat it."
"I have prepare the apple for you. Don't forget it."
Which sounds natural?
There are several errors in your sentences. "got" is incorrect here. get/got have many meanings - see http://esl.about.com/od/vocabularyre...ses-Of-Get.htm
You have used "bring" where I think you mean "give". I suggest looking at the dictionary for these verbs.
Also: "have prepared" not "have prepare" - Use past participle after "have".
Finally: "I have prepare an apple for you." You need to study the rules for articles i.e. "the" and "a/an"