I am open here, but somethinglike:
Matt there is no-one to help with Art, with Maths he can join to the first one on senior list Harry,
Gemma can join on English with Jake
So everyone joins once to a senior based on their subject. They I can pair them off to work together. I do not know how to correctly pair a student with a senior based on their requirement. I only want a 1-2-1 relationship. I hope I have explained myself well.