I was in-touch with my friends during my HSC exams last year, in fact, I often studied with them and ate out with them after each exam to calm ourselves down. Obviously this person we're talking about is either really blank, up-herself that she felt she didn't need to discuss anything with anyone else, typed the timetable released by BOS into MS word so that she could create her own timetable (a lot of people do this) and mistyped the maths exam for a different date, or, OP is trolling.
Or was not prepared nor sick and felt this the only avenue.