it's more clean your way but it's grammatically acceptable both ways
English
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No it's not grammatically correct unless it's skolas (plural) getting revenge. But, there is only one skolas, so, therefore the possessive apostrophe doesn't need the 's' after it.
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A possessive contraction ending in s can be spelled either way. It's not the most common usage, and definitely not the easiest to pronounce. But, it's still correct english on a technicality.
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Only if the object possessing the item is plural James' book (book owned by James) James's cinema. (Cinema owned by 2 or more James) Just like you can't really plural the names either 1 Jack. 2 Jacks 1 James. 2 James So Skolas's is only correct under the pretence that there is 2 or more Skolas.
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Or if the subject is his revenge and he has multiple things to be vengeful for. English can be turned every which way. It works either way.
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hmm my bad then lol. that's really gonna bug me
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That's why it's getting on my nerves already, and considered I live in some place in England where NOBODY knows how to read apostrophes ((there's a place nearby called "St. James' Park", but FÚCKING EVERYONE pronounces it 'St. James's Park" which is completely wrong. However, confusingly enough my dad used to work for and still works in association with a place called 'St. James's Place'))