Sweet memories in school life

[Mthirum]

Can you correct this - "There are many sweet memories that I have experienced in my school days. One of them is when I got class first in one subject that is english paper and I scored 83 marks. And it happened when I was studying 5 standard. That was one of the sweet memories in my school life."

[Mister Micawber]

I have many sweet memories from my school days. When I was studying 5 standard, I got class first on an English paper and scored 83 marks. That was one of the sweetest memories of my school days.
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Native English teacher at Mister Micawber's

[Mthirum]

Thank you sir.

[Puppet]

Hello,

If I'd like to use "flashback" instead the first part of this - i mean " to have many sweet memories from my school days." shall i say: I have wonderful fhashbacks of the time i was in school.

Sounds ok?

[Mister Micawber]

No, flashbacks are not the same as memories: they are sudden hallucinations of traumatic events.
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Native English teacher at Mister Micawber's

[Puppet]

Oh.. ok, thank you.