I'm having difficulty understanding when to use students' vs students. I know you use students' when you're talking about more than one student. For example: "The students' homeworks were marked". However, when can you use students? Are they interchangeable. Could somebody tell me whether the following sentences is correct:
"Outside my formal education, I enjoy teaching and I’ve been tutoring students in A-Level Mathematics since starting my degree. Additionally, ... I started a scheme intended to help first year university students’ in their studies."