How do I know what I’m revising is right to use in the tests?

So basically, as I do history I’ll give you a history example of what I’m trying to say. So for example I have to learn about the impact of the treaty of Versailles . So I’ve gone and done some revision at home on the impacts of the treaty of Versailles but I’m quite worried as I think I may have learnt the wrong facts that I haven’t learnt in school and I may write it on the exam and I won’t get marks for it even though I’m technically right. Any help would be appreciated 👍 :smile: