Is it clear and natural to say "rehearse the IELTS test"?

In the US, we would say "I am doing the exercise to practice for the IELTS test." We use "rehearsal" for performance-oriented things, and for larger (more people and/or more involved than one person sitting taking a test) things. We rehearse music and theater performances, we practice tests and batting skills. And standardized tests. As a side issue, "Doing exercise" sounds unnatural -- we would put an article in front of the exercise - "Doing an exercise", "Doing this exercise", etc. This assumes that "exercise" is one part of the practice exam; if that isn't the case, I don't know what "Doing exercise" is trying to say.