Organising an assignment into 5 paragraph essay APA format.

I have already written an assignment. It´s being returned over and over again due to not being organised properly. I don´t understand what I am doing wrong, and looking for help in organising the already written paper into a 5 paragraph essay APA format with this outline:

I. Introduction

II. Body

    A. body paragraph 1 will be Part A

    B. Body paragraph 2 will be Part B

    C. Body paragraph 3 is Part C

III. Conclusion

IV. References

You are free to edit and cut out as much as you want.