American English Corrections

My Day

Today was an exhausting day. I woke up at 7 A.M and started the day with 3 hours of accounting. Then, I had ("Had" sounds more natural here unless you mean you took it out of a cooler at a deli, etc.) a light sandwich as a meal, and I had another 3 hour We actually use the singular here. class about the economy. You could also write "Then, I had a light sandwhich and a/another 3 hour class about the economy." or "Then, I had a light sandwhich followed by a/another 3 hour class about the economy.", both of which sound better. Once I was done with these, I had to work on a team project related to logistic operations.

It's not over yet! I also went to the gym for 1.5 (I think you mean 1 hour and 30 minutes, correct? We don't write "1:30 hours". We write it as "1.5 hours".)  hours with a friend of mine.

Now, I need to relax. I've got my exams in 10 days, but after that, I'll have a week off Or "a 1 week vacation", so I guess it's worth it.

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My day

Today was an exhausting day.
I woke up at 7 A.M and started the day with 3 hours of accounting. Then, I took a light sandwich as a meal and went for another 3 hours class about economics. Once I was done with these, I had to work on a team project related to logistic operations.
It's not over yet! I went to the gym for 1:30 hours with a friend of mine.
Now I need to relax, I've got my exams in 10 days, but after that, I'll have 1 week of vacations, so I guess it's worth it.