Hi Maude, your text is nearly perfect! It would be slightly more natural to combined the sentences in the final  line (and perhaps the second last line) because the sentences are so short and deal with the same subject. Using 'could not' speak english doesn't quite work because that puts it in the past, and I understand you are talking about your present situation of wanting to improve your english from now on. 

Anyway, nice work! Andrew

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Hey! This is very good, there are only a few small things I would have done differently.

If I'm not mistaken, the English name for Bretana is Brittany.

'At' school has the implication of being in the building itself. If you mean high school education more generally you say you're in school.

Personally, I would leave out the 'so' because it would normally refer to a reason in the same sentence. You could rephrase it to 'My spoken English isn't very good, so I would like to improve it now.'

I don't really have a good grammatical reason for changing 'have you got' to 'do you have' - I would personally use 'have you got' for physical objects, eg.: 'have you got a pen?'

And lastly, keep in mind that there's no space between the sentence and an exclamation or question mark. You already did this right a lot of the time though :)

Hope this helps!