It's unclear whether anyone will have to make up year 7. Draco was at school during DH, but Snape was headmaster and the Carrows were teaching, so everything was kinda crazy. Some fanfic authors use that to say Harry's year mates have to go back. OTOH, some fanfic authors write it so not even Harry has to retake that year--he jumps right into Auror training or whatever else. It's kinda anything goes insofar as what people are doing school-wise afterwards.
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It's unclear whether anyone will have to make up year 7. Draco was at school during DH, but Snape was headmaster and the Carrows were teaching, so everything was kinda crazy. Some fanfic authors use that to say Harry's year mates have to go back. OTOH, some fanfic authors write it so not even Harry has to retake that year--he jumps right into Auror training or whatever else. It's kinda anything goes insofar as what people are doing school-wise afterwards.