Entering new student names into a group

When differentiating work for students, it is really useful to be able to change the structure of individual groups, eg when a new student arrives in a class, or when a student is more (or less) advanced than his/her peers in a particular year group. This helps to ensure that every student receives the right level of language practice, irrespective of their expected attainment according to the school rostas! https://www.youtube.com/watch?v=k92K9I0Godw