Learn Finnish. D10
Is this text correct?

Kun olen tullut leiriin, menen vuorelle. Minä menen metsään joka viikko. Minä olin merellä, mutta minä en ollut vuorella.

Kun olen tullut leiriin, menen vuorelle. - When I come to camp,I will go to mountains.
Minä menen metsään joka viikko. - I go to the forest every week.
Minä olin merellä, mutta minä en ollut vuorella. - I was at sea, but i wasn’t in the mountains.

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Very good! There´s only a little mistake, change
"Kun olen tullut leiriin" (strictly translated to english would be "when I have come to camp)

so change it to
"Kun tulen leiriin" = "when I come to camp"

This is very small mistake, I just corrected that so that it´d fit perfectly the english translation. So, if there hadn´t been any english text to refer to, I wouldn´t have changed it. This is very kirjakielimäinen (standard written language) text, which it should be if you have some kind of finnish language exam. Good work. If you want to use those sentences in everyday language, I´d change them a bit, but everyone understands those so you can also just use them how they´re now.