"learning about my english level"

Number of question I got right 85 from 90 Grade in percentage 95%
Question you got wrong	Language item	My mistake / Correction	Reflection
12	simple Present	I am looking forward the summer holidays. I am looking Forward to the summer holidays.	When I use forward, I always have to use (to) after this.
20	Simple past	They were so hard questions that I had no chance. They were Such hard questions that I had no chance.	I thought so was correct in every adjectives, but Such is the correct adverb to hard.
54	Simple present	He's a friend of them. He´s a friend of theirs.	I really didn´t understand why is theirs and not them, because the preposition of confuse me.
64	Simple present	I prefer drink beer than wine. I would rather drink beer that wine.	I didn´t know how to use would rather because I’ve never seen it.
82	Simple present	Hubert is an uncle of Kim. Hubert is an uncle of Kim’s.	The same mistake that in question 54, I didn´t understand why Kim’s if the sentence has a preposition (of)