Condition in which a person has an obsession to be perfect.... The person also typically works too hard at school and double checks work very frequently. It should also be mentioned that the person suffering from Heidi Syndrome or colloquially known as Heidism also goes the extra mile with EVERYTHING (including extra-curricular activities!).
Building a test track for a competition = Heidi Syndrome
Spending a week double checking a report, only to actually finish the day before its due is another Heidi Syndrome type activity
Trying to get as many scholarships as possible = more Heidi Syndrome activity