Hello!
You should take the creative writing you've done in the past 12 weeks and explain a little bit about some selected parts. Tell them about your favourite part, how long it took you to write, and what your writing was about.
Be sure to include an introduction/hook, and paragraphs 1, 2, and 3. Paragraph 1 will begin the essay. "I'll be reviewing the creative writing I've done in these past 12 weeks, today!"
Paragraph 2 is like the middle, where you're explaining the main parts of the essay.
Paragraph 3 is the conclusion. This is where you will conclude your essay. "...and that was my essay on creative writing!"
Good Luck!