WToday when I went into school and I waited, when I was waiting in the hallway to go into my class room on the hallway,, some people who are in grade 12 went throught thate hallway. Today when I went into school, when I was waiting in the hallway to go into my class room, some people who are in grade 12 went through the hallway.

Instead of "people who are in grade 12" you can just write "12th graders" or "grade 12 students".

They were men and women, and talking and putting on perfumes on each other a lot for fun. They were talking and putting perfumes on each other for fun.

No need for the first bit.

Me and the other students on the hallway, we all had a bad cough and, so it was so tough to endure. Me and the other students on the hallway all had a bad cough, so it was tough to endure.

Some people also didn't like strong smell, so I didn't wanted them to do itstop. Some people also didn't like strong smell, so I wanted them to stop.

Also --> in addition to the bad cough making it a bad experience "I wanted them to stop" sounds better than just not wanting them to do it, since they are already doing it.

If ithat was the end of their play, it would so happyhave been good, but they did an even more dangerous and terrible thing. If that was the end of their play it would have been good, but they did an even more dangerous and terrible thing.

Only a person/living being can be happy, not a situation.

It happened when every people wereone was moving to the next class room. It happened when everyone was moving to the next class room.

Everyone was OR all the people were

There are lockers next to the class room witch was our next class room, and me and my classmates were waiting next to thatese lockers. There are lockers next to the class room, and me and my classmates were waiting next to these lockers.

Witch = a magical lady with a pointy hat and a broom Which = connecting word Also no need to specify which classroom it was, as you already established this at the start of the paragraph. These lockers --> plural It could be these or those, but these is for things close to you and those if for things far away from you

People who had these lockers, were grade 12These were the 12th graders' lockers. These were the 12th graders' lockers.

I reworded this to make it sound more natural. It's better to say this in one go, without a comma. When using an apostrophe to indicate possession, add if AFTER the s for words already ending in an s, and before the s for words ending in another other letter. Australia's diplomats VS the United States' diplomats

Two men in grade 12 took out of something that looked like a spray, and it was perfume. Two men in grade 12 took out of something that looked like a spray, and it was perfume.

This is kind of nitpicky but it I'm not sure if 12th graders are men yet if they are not 18 yet. If you don't want to use "boys" either, you could use "guys" to make it more neutral.

But I didn't realize it was perfume because in my imagination of perfume wes are different. But I didn't realize it was perfume because in my imagination of perfumes are different.

If you are talking about perfumes in general --> as in, you didn't imagine that any perfumes could look like that.

They were talking about something and one of them pointed at the edge of the locker. They were talking about something and one of them pointed at the edge of the locker.

AndThen the other person suddenly threw it at the edge. Then the other person suddenly threw it at the edge.

I thought: "it'llthat's dangerous", and I reflexively turned away. I thought: "that's dangerous", and I reflexively turned away.

OR "That will BE dangerous" Will needs to be followed by another verb, as it only marks the future tense, but doesn't specify what will happen.

So l was able to avoid to getting hit by shards of the perfume bottle. So l was able to avoid getting hit by shards of the perfume bottle.

Other people who was ere in the same place, the also luckily didn't get any injur luckilyies, but we all had a bad cough again. Other people who were in the same place also luckily didn't get any injuries, but we all had a bad cough again.

My uniform might gothave gotten soaked in that smell, so I am going to laundryer it. My uniform might have gotten soaked in that smell, so I am going to launder it.

OR you could just say "I am going to wash it."

It was the most frustrating matterthing that happened today. It was the most frustrating thing that happened today.

OR "Today was very frustrating."

I hadThere was an assembly of grade 12s in the gym after this case happened. There was an assembly of grade 12s in the gym after this case happened.

AN before any word starting with a vowel (a, e, i, o, u)

The representative of the grade 12s gave a speech and some teachers were giving encouragements or reviewing their hight school life together. The representative of the grade 12s gave a speech and some teachers were giving encouragements or reviewing their high school life together.

I know they were doing their best in their hight school life and today was the last assembly for them, so they were very excited, but while teachers giving speech, it came up with the perfume case came up and I couldn't give them a clapclap for them as they exited with a clear mind. I know they were doing their best in their hight school life and today was the last assembly for them, so they were very excited, but while teachers giving speech the perfume case came up and I couldn't clap for them as they exited with a clear mind.

I am going to have three tests next week and they arwill all be so tough. I am going to have three tests next week and they will all be so tough.

So, I have to memorize scientific words for the science test, practice for rollthe play of Macbeth, and othermany other things. So, I have to memorize scientific words for the science test, practice for the play Macbeth, and many other things.

MemoriZe = US English MermoriSe = British English Quick summary: https://www.cambridge.org/elt/blog/2017/09/08/american-british-english-spelling/