You can help with writing skills-wise, but the thing with essays is that they are subjective and do not have a single correct answer. I took a few STEM courses

You can help with writing skills-wise, but the thing with essays is that they are subjective and do not have a single correct answer. I took a few STEM courses and found that it was common for STEM students to work together on problem sets because they could compare answers to figure out if and how they had gone wrong. There is no equivalent to this in liberal arts.