Проверьте пожалуйста, если не верно, то скажите где ошибка и Исправте

Правильно :
who's the friendliest person in your class?
Nastay is the friendliest person in my class
Is your best friend taller than you? (здесь правильно)
No, he isn't. I'm taller than my best friend.
4. Which is the hardest lesson for you? (правильный вариант)
Maths is the hardest lesson at school for me.
5. Who has got the longest hair in your class? (верный вариант)
Alina has got the longest hair in my class
6. Are you older than your best friend?
No, I'm not. My best friend is older than me либо можешь написать I'm younger than my best friend.
7. Which is better - a picnic in a forest or a picnic at the seaside? (изъясненье - nice=good)
A picnic in a forest is better than a picnic at the seaside.