Our children are going through the DELF exams at school and have only just taken their B1 after having been at school in France for four years and obviously they are pretty fluent but in their own environment - language outside the school environment can sometimes still confuse them. Do they just continue to take an exam each year if they continue to pass it? I ask because they noticed this year that not all the children that sat the A2 test were with them for the B1, even though they mostly passed last year's A2.