(That's equivalent to an A.) How much did you revise in the year 10 to 11 summer?
Getting a 7 is somewhat difficult but at GCSE but I think if you're the kind of person to study in the summer before as well then it is achievable. Unless you struggle with basic writing & maths, then GCSEs aren't hard if you study hard and have good advice.
if your smart its not hard at all... assumming your school has sets for subjects like maths, the majority of the top class could go into the exam and get an easy 7