How can I remember my monologue???

What I do to memorize monologues, or really anything, is just keep saying it over and over again. Make sure you understand it completely--what's happening and the flow if it and everything. After reading it many times and making sure you understand it, you'll find that you'll have it practically memorized. You can also, though this isn't my favorite method of memorization, read the first line, memorize it, read the second line, memorize, then memorize the first and second lines, then move on to the third, memorize it, put the three lines together, memorize, and so on.