In all transparency, I think you will have to approach your essay assuming they will look for everything -- writing, content, structure and formatting as well as a unique, compelling story. A strongly written essay will have all these elements. The fact that some may focus on one area versus another is very subjective so I would urge you to focus on your story, build an outline and highlight key content areas or examples you want to showcase. One way to get a little exposure is to do a little research and look up best practices for college application essays. A quick Google search will pull up loads of samples and articles on what colleges may look for. This should help guide you in the right direction.
If you need help with your writing, there are plenty of low-fee tutorials and sources that can help you if you do a little searching. You can also look for a writing center at your school.
Hope this helps!
Stefania recommends the following next steps:
- Draw an outline of they key points you want to tell in your story
- Research best practices and examples to get inspired and gain some direction
- Have someone proofread and share feedback.