Please, if you have any subjects or anything I could talk about, I'd love to do so !

Today, I woke up at 6:35 a.m. like almost every day as I almost start schoolbecause school starts at 8 o'clock.

Then I ate my breakfast and read the subject I will havehad to talk about during the NIS (Numeric and Informatic Science) class I had at 8 a.m.

When I started the project, 2 months ago, to be honnest, I didn't really like. it

NIS is definitely one of the subject I like the less.ast

I think it's difficult to write/code your own programs and I don't really like to use Python.

During the presentation of the project, I mimicked a man who would have did this project because he wanted to, and acted like I wasloved and I pretended to be fascinated about that.

I think our presentation was pretty nice, we detailed well every program,¶
well so that everybody could understand.

Today, I wanted to write something in this app but I didn't have any ideas so I decided to talk about my day.

Please, if you have any subjects or anything I could talk about, I'd love to hear them!

"I'd love" is an incomplete phrase. The full expression is "I'd love to (do something)".

Today, I woke up at 6:35 a.m. likeas I do almost every day as I almost start school atround 8 o'clock.

(1) "As I do almost every day" sounds more natural to me. There's a technical and grammatical explanation for this, but I think I'll spare you it.
(2) The phrase "I almost start school at 8 o'clock" doesn't make sense to me. Perhaps you meant that you start school around 8 o'clock.

Then I ate my breakfast and read up on the subject I will have to talk about during the NIS (Numeric and Informatic Science) class I had at 8 a.m.

You can "read" a document" but not "read" a subject. The phrase to use here is "read up on (a topic)".

It was about a project we started 2 months ago, about the intuitive writtingautocorrect, the tool which helps you to type in faster on your phone by correcting the mistakes you make.

(1) Removing the first comma might help the sentence flow more smoothly.
(2) By "intuitive writing", do you mean autocorrect? I have never heard "intuitive writing" in the context of technology.
(3) "Type in" is typically followed by a noun, for example: "type in your name", "type in your address", etc.

When I started the project, 2 months ago, to be honnest, I didn't really like it.

When used as a verb, "like" is typically followed by a noun.

NIS is definitely one of the subject I like the lessast.

The expression is "like the least".

However, as I worked with a friend who is pretty good in this subject, we managed to program everything we had to and we made a presentation on PowerPoint.

Removing the second "we" will make the sentence less rigid and help it flow better.

It wasn't beautiful, but it wasn't that bad neither.

"Neither" is not used this way. In this case, we would use "either" instead.

During the presentation (of the project), I mimicpretended to be a man who would have didone this project because he wanted to, and acted like I was fascinated about thaby it.

(1) You may omit "of the project". The reader will understand what you're talking about.
(2) "Pretend" seems more appropriate than "mimic" here, because you were also trying to convince your audience that you were interested in the subject. In my experience, "pretend" has that additional persuasive element.
(3) Note that the past tense "pretended" is used, because you're writing about a past event. You used the present tense when you wrote "mimic".
(4) "Would have did" is ungrammatical.
(5) "Fascinated about (something)" sounds quite unnatural to me. If this expression exists, it's certainly not a common one. "Fascinated by (something)" sounds much more correct.
(6) "That" would refer to the fact that you pretended to be interested in the project, rather than referring to the project itself. "It" would unambiguously refer to the project.

And the teacher laughed and didn't really trust me aboutbelieve me on that but at least, it was funny!

(1) There's a difference between "trust" and "believe". To "trust" means to have confidence in someone or something, while to "believe" means to accept that something is true.
(2) The expression is "to believe (someone) on (something)".
(3) The use of the comma is a little awkward.

When I started to introduce the subject, I was a little bit stressful,ed, but then I started to become more and more confident until I talspoked easily.

(1) Something is "stressful" if it causes stress. On the other hand, someone is "stressed" if they're experience stress.
(2) I would suggest the addition of "but", as it makes it clearer that a change occurred.
(3) "Spoke" sounds more natural to me than "talked" here. I think in the context of presentations, "speak" is used more often.

I think our presentation was pretty nice, we greatly detailed well every program, so that everybody could understand.

"Detailed well every program" is okay. It is the more literary version of "detailed every program well", but we don't see this grammar construction too often especially in casual, everyday writing. I would suggest "greatly detailed every program" instead.

As a matter of fact, we detailed tso much so,that it actually lasted 16 minutes rather than 10.

I hope I will get 16 out of 20, i. It would be great because that'is is not the subject I'm the best in so it would be a super grade.

(1) I recommend breaking this sentence up into two, because the two parts sound like separate thoughts.
(2) "This" sounds more natural than "that", because NIS is a central subject of your writing.

Today, I wanted to write something ion this app but I didn't have any idea so I decided to talk about my day.

Please, tell me if you have any subjecttopics or anything I could talk about, I'd love that!

Today, I woke up at 6:35 a.m. like almost every day as I almost start school at about 8 o'clock.

Then I ate my breakfast and read the subject I will have totopic that I will talk about during the NIS (Numeric and Informatic Science) class I had at 8 a.m.

It was about a project we started 2 months ago, about the intuitive writting, the tool which helps you to type in faster on your phone by correcting the mistakes you make.

Everybody in the class had the same subjecttopic.

When I started the project, 2 months ago, to be honnest, I didn't really like it.

NIS is definitely one of the subject I like the lesmy least favorite subjects.

However, as I worked with a friend who is pretty good in this subject, we managed to program everything we had to and we made a presentation onusing PowerPoint.

It wasn't beautifulgood, but it wasn't that bad neither.

During the presentation of the project, I mimicked a man who would have didone this project because he wanted to, and acted like I was fascinated about that.

When I started to introduce the subjecttopic, I was a little bit stressfulnervous, then I started to be more and more confident until I talked easily.

I think our presentation was pretty nice, we detailed well every program, so that everybody could understand.

As a matter of fact, we detailed too much, so, it actualy lasted 16 minutes rather than 10.

I hope I will get 16 out of 20, it would be great because that's not the subject I'm the best inat so it would be a supern excellent grade.

Please tell me what you thought of my English, and feel free to give me some advice and subjects or whatever to talk about!