What's my eEnglish level?

This is my first time using things platform, iand I appreciate every tip from everybody :) ¶
As an iItalian i, I'm not an english native native English speaker.

My father usentd to send me to an eEnglish private course after school when iI was 12 years old, i. I used to go/went to this private course for 6 years, until iI was 18 years old.

Past continuous
I don't think past continuous is necessary in the second sentence if it's in the first sentence

As iI can remember i, I was good at it, iand I attended the final Cambridge exam and passed with level B2, so if iI'm right i, I am at a medium level, but iI don't feel like it.

I dohave not practice ed English for 4/-5 years, so i have the suspect iI suspect that I have forgotten how to talk and express myself in eEnglish.

This is why iI decided to write this letter/text/post.

A letter is a formal message addressed to someone, this is just a simple piece of writing

The problem is that iI'm graduating in cybersecurity at university and iI'm looking for a job, i. I use the technical eEnglish for studying and programming on visual studio and other softwares, but we are talking about very basic eEnglish, not Shakespeare or the dialectic of Queeln Elizabeth, so what's the point?

My teacher suggested me tothat I should apply for an internship inat NATO, and they recquire to be fluentcy in eEnglish, but iI don't know if iI can consider myself "fluent" or if I'm just an iItalian guy who can explain himself with hand gestures.

Just to say: iI wriote this text as a river of thoughts, in a couple of minutes to make it the mostas realistic as possible.

I will appreciate everybody who gives me tips to improve my eEnglish to make it sound more natural, iand I also appreciate any judgment on this.

What's my eEnglish level in your opinion?

This is my first time using things platform, iI appreciate every tip from everybody :) ¶
As an iItalian iI'm not an english native speaker.

My father sent me to an eEnglish private course after school when iI was 12 years old, i used to goI went to this private course for 6 years, until iI was 18 years old.

As i canI remember iI was good at it, iI attended the final Cambridge exam and passed with level B2, so if iI'm right iI am a medium level but iI don't feel like it.

I dohave not practice ed English for 4/5 years so i have theI suspect iI have forgotten how to talspeak and express myself in english.

This is why iI decided to write this letter.

The problem is that iI'm graduating in cybersecurity at university and iI'm looking for a job, iI use the technical eEnglish for studying and programming on visual studio and other softwares, but we are talking about very basic english, not Shakespeare or the dialectic of Queeln Elizabeth, so what's the point?

My teacher suggested me tothat I apply for a internship in NATO and they recquire to be fluentcy in eEnglish, but iI don't know if iI can consider myself "fluent" or iI'm just an iItalian guy who can explain himself with hand gestures.

Just to say: iI wriote this text as a river of thoughts, in a couple of minutes to make it the most realistic possible.

I will appreciate everybody who give me tips to improve my eEnglish to make it sound more natural, iI also appreciate any judgment on this.

What's my english level in your opinion?

What's my eEnglish level?

"English" is the name of a language. It's a proper noun and should be capitalised.

This is my first time using things platform, iI appreciate every tip from everybody. :) ¶
As an iItalian iI'm not an english native native English speaker.

(1) "I" is always capitalised.
(2) Similarly to "English", "Italian" is the name of a nationality and is also capitalised.
(3) "Native English speaker" is much more natural than "English native speaker". In English, we arrange adjectives in a specific order (the more important the adjective, the closer it is to the noun), and knowing what that order is will largely come from exposure.

My father sent me to an english private English course after school when iI was 12 years old, i used to goand I went to this private course for 6 years, until iI was 18 years old.

(1) Similarly to "native English speaker", I think "private English course" sounds more natural. The fact that the course teaches English is more important than the fact that it's a private course.
(2) I think adding the "and" will make the transition smoother.
(3) From my experience, "used to (do something)" is generally not used when the time period or duration ("6 years" in this case) is specified.

As iI can remember iI was good at it, iI attended the final Cambridge exam and passed with level B2, so if iI'm right iI am a t an intermediumate level but iI don't feel like it.

(1) Here, "as" implies a causal relationship: you attended the exam BECAUSE you can remember you were good at it. The further implication is that you also took the exam relatively recently. Reading your sentence, I got the feeling that this wasn't what you meant (specifically because of the uncertainty conveyed by "if I'm right"), but if it is, then your original expression is okay.

(2) You can't "be a level", but you can "be at a level".
(3) For skill levels, "intermediate" is more appropriate than "medium".
(4) Alternatively, instead of "I don't feel like it": "it doesn't feel like it".

I dohave not practice ed English for 4/ or 5 years so i have theI suspect iI have forgotten how to talk and express myself in eEnglish.

(1) "4 or 5 years" refers to a time in the past, so the past tense is expected. In this context, the past perfect tense feels more appropriate.
(2) In my experience, the slash ("/") isn't generally used to replace "or" in this context.
(3) Alternatively: "I have not practiced English for 4-5 years" or "I have not practiced English for 4 to 5 years".
(4) suspect: a person thought to be guilty of a crime. The noun form of the verb "suspect" is "suspicion". Even so, in this context, I believe "I suspect that..." is more common and probably more natural than "I have the suspicion that..."
(5) "Have forgotten" is in what we call the past perfect tense. It is used when no time frame is specified for an event. Since you did not state when exactly you'd forgotten how to talk and express yourself, the past perfect is expected here.

This is why iI decided to write this letterpost.

This is not a letter. You can consider using "post".

The problem is that iI'm graduating in cybersecurity at university and iI'm looking for a job, iI use the technical eEnglish forwhen studying and programming on vVisual sStudio and other softwares, but we are talking about very basic eEnglish, not Shakespearean or the dialectic of Queel ElizabetElizabethan English, so what's the point?

(1) We generally don't use "the" before languages like "English", "Italian", etc., even when specifying a particular type of the language.
(2) "Visual Studio" is the name of a piece of software and should be capitalised.
(3) "Software" is an uncountable noun, so we don't say "softwares". To make it countable, you can say "pieces of software".
(4) The terms you're looking for are "Shakespearean English" and "Elizabethan English".

My teacher suggested me to(that) I apply for an internship inat NATO and they recquire me to be fluent in eEnglish, but iI don't know if iI can consider myself "fluent" or if I'm just an iItalian guy who can explain himself with hand gestures.

(1) "Suggested me to (do something)" sounds ungrammatical to me. The phrase is "suggested that I (do something)".
(2) "Internship in (an organisation)" is the wrong collocation. The phrase "internship at (an organisation)".
(3) You need to repeat "if". This is because if you don't, there will be some ambiguity: is it "I can consider myself fluent AND I can consider myself just an Italian guy", or is it "I don't know if I can consider myself fluent AND I don't know if I'm just an Italian guy"?

Just to sayFor the record: iI wriote this text as a river of thoughts, in a couple of minutes to make it the mostas realistic as possible.

(1) "For the record" is the perfect phrase to use here that communicates what you want to convey.
(2) When "possible" is used with an adjective like "realistic", we use the construction "as [adjective] as possible". The construction you used is for when it's used with a noun: "the most [adjective] [noun] possible".

I will appreciate everanybody who gives me tips to improve my eEnglish to make it sound more natural, iI also appreciate any judgment on thismy writing.

(1) "Anybody" is more commonly used in this context and probably more natural.
(2) It should be "gives" and not "give", since both "everybody" and "anybody" are singular.
(3) It might be unclear what "it" refers to. You can make it more explicit with a phrase like "my writing", "this post", etc.

What's my eEnglish level in your opinion?

What's my eEnglish level?

Languages are always capitalized.

This is my first time using things platform, iI appreciate every tip from everybody :) ¶
As an iItalian i, I'm not an eEnglish native speaker.

"I" is always capitalized and so are nationalities.

My father sent me to an eEnglish private course after school when iI was 12 years old, iI used to go to this private course for 6 years, until iI was/ turned 18 years old.

As ifar as I can remember iI was good at it, iI attended the final Cambridge exam and passed with the level B2, so if iI'm right iI am a mediumt an average level, but iI don't feel like it.

I doid not practice eEnglish for 4/5 years, so i have the suspect iI suspect that I may have forgotten how to talk and express myself in eEnglish.

This is why iI decided to write this letter.

The problem is that iI'm graduating in cybersecurity at university and iI'm looking for a job, i. I use the technical eEnglish for studying and programming on visual studio and other softwares, but we are talking about very basic eEnglish, not Shakespeare or the dialectic of Queeln Elizabeth, so what's the point?

My teacher suggested me to apply for a internship in NATO and they recquire to be fluent in eEnglish, but iI don't know if iI can consider myself "fluent" or iI'm just an iItalian guy who can explain himself with hand gestures.

Just to say: iI wriote this text as a river of thoughts, in a couple of minutes to make it the mostas realistic as possible.

I will appreciate everybody who give me tips to improve my eEnglish to make it sound more natural, i also appreciate any judgment on this.

What's my eEnglish level in your opinion?