Correct my paragraphs

Kindly, I want you to correct my paragraphs and tell me what I supposed to write instead of my mistakes.
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My university life
My university life started in 2014. I'm studying at PNU. It's one of the best universities in my country.
I'm still in preparatory year. I'm studying Math, IT, English and communication skills. I want to study law because I want to be a lawyer and I think it's one of the best jobs out there. The best thing about studying is when you work hard and reach your goal or your dream job.
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How do I spend my free time
I have a lot of free time on weekends. I usually drink mint tea and stare at the ceiling when I want to relax. I also like to do my hobbies on my free time such as swimming and drawing. I often do my hobbies as much as I could.
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Food and Cooking
I'm a foodie. Cooking is one of my favourite things to do although I don't like to cook for a lot of people.
My favourite meals to cook are burgers and steaks. I also like to cook and eat other countries food because I like to try new food as much as possible.
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My holiday
Holidays are one of the best things on the whole world. I usually spend my holidays by traveling or going to my aunt's farm. I once went to the USA. I visited my cousin and she took me everywhere. We went to Miami and we had fun at the beach. It was pretty awesome
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A happy event in my life
There are a lot of happy events in my life. One of my happiest events was in 2013 and in my school. It was when I graduated from high school. It was one of the greatest days I ever had. I had a lot of fun and it was a very enjoyable day.
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That's it.
Thanks a lot to whoever going to correct them.