As you have observed, both AmE and BrE can be found in the exercises, but the majority of the work is common to both.
If you have any confusion as to whether a particular question or set of questions is in a particular form of English, you can always ask on the forums, but the two forms are not as far away from each other as you might imagine, so most of the time it really won’t matter.
As one of the co-founders I must tell you that we aren’t really bothered about what variant of English is used both in the tests or by users of the forum. The only criterion is that it should be both acceptably and grammatically correct.
It is not an issue that you need be worried about.
I belive the question is valid because of different spelling of some words in US English. I wonder if some of your tests are designed to accept both versions.
I think the question is great. Because, I see there are some words just used only in American English. It’s important for some one who will take IELTS test
Can you give an example of a word which is exclusively used in American English only? I can’t think of one and I don’t imagine it would make any difference in a test.
Yes, that is typically (though not exclusively) AmE use, and probably penned by one of the AmE question setters who were on the forums at the time they were created (my guess would be Linda), though you still haven’t explained where it is.
Using the simple past instead of the present perfect is absolutely standard in modern business English so the phrase is correct English. Rob needs to brush up on his grammar if he wants to use our forum to peddle his website