I had to make a presentation for the University, well Imy class, but it was a mess. I had to make a presentation for my class, but it was a mess.

"For the university" sounds like you presented to the entire school. If you are only making a presentation for a class, be specific!

I had to make a presentation for the University, class—well I, it was a mess. I had to make a presentation for class—well, it was a mess.

I slept 4four hours in two days in order to prepare for it, but it wasn't enough. I slept four hours in two days in order to prepare for it, but it wasn't enough.

But for some reason, I don't feel sad or dissappointed. But for some reason, I don't feel sad or disappointed.

I feel thatas though I have to work harder to know the theory and the practice requeried in the real lifeunderstand the real world. I feel as though I have to work harder to understand the real world.

"to know the theory and practice the required" is unclear. You want to work harder to understand how the real world works, so we'll say this instead!

I feel that I have to work harder to know the theory and the practice requerired in the real life. I feel that I have to work harder to know the theory and practice required in real life.

Because at the university we only learn from books, and for that reason I didn't feel prepared to face the real worldreality. Because at the university we only learn from books, so I didn't feel prepared to face reality.

Making it flow a little better and adding casual context.

Because aAt the university we only learn from books, and for that reason I didn't feel prepared to face the real world. At the university we only learn from books, so I didn't feel prepared to face the real world.

Now I discovered the key to be more prepared for my futures jobs. Now I discovered the key to be more prepared for my future jobs.

Now I have discovered the key to being more prepared for my futures jobs. Now I have discovered the key to being more prepared for my future jobs.