We have the adjective mock in English to describe anything that is going to be real (to me, it has a direct connotation of a simulated thing like an examination).
For instance, we have a test standard called mock test/exam/etc. which as a practice is taken before the official examination! Like: In IELTS mock test (BE)
But as you see, it is a sort of BrE term which suits for the IELTS examination.
What do you call such simulated exams for an American standard like TOEFL?
There are some links for TOEFL mock test, but as dictionaries mentioned, the word "mock" does not fall into the AE terminology.