WJEC Edugas here for RE with Christianity & Islam. The school has always made them sit a half GCSE in year 10, but they decided this year would be special and would have the privilege of taking the full GCSE in year 11 instead. They've reverted to the old system for the current year 10s. This means the staff are trying to get 2 year groups through their GCSE in the summer and have no idea whatsoever what they are doing.
I threatened to withdraw DD after Easter, as her predicted grade is such an anomaly with her others. Her teacher has succeeded in turning a subject which DD actually quite enjoyed at the start of the course into the equivalent of someone scratching nails down a blackboard, a thoroughly painful experience.