Students+Change

Adapting GVC into upper grades when students change classes during the contest period.
In some countries, students change classes on a semester, or quarter or trimester basis. This rarely fits into the October 1 to March 31 timeline.

//Image: [CC, by Frits Ahlefeldt]//

Suggestions to make this work. Please add more...
 * 1) Decide on which group you will have for the longest time period and from that group engage some students to work in a club-like situation during the time period in which they are no longer in the class or the time period before they begin the class.
 * 2) Teacher and one or two students make the initial contact; then whole class join in when the formal class begins.