I am currently a PhD student (on a teaching scholarship) at a UK university. A part-time MSc student in one of my classes has asked me for some advice on how they can prepare for their courses next year. I'd like to suggest that we spend some time over the summer (when there are no classes) learning something that would be mutually beneficial to us (in a sort of reading group style). I feel that this would be a good opportunity to motivate myself to learn some basic things that are missing from my education and also perhaps to make a friend. However, I wonder whether this would be unethical as it could potentially lead to this student having an "unfair" advantage over their peers?
Note. Other PhD students in the department tutor some of their students privately (for money).