karioca,
If you get called to attend the DLR with LH IT they send you info. to download, to prepare for the test including a 5 page PDF on the MIC. They don't however, provide a CBT for the MIC as they do with the other subjects in the test. Apparently you can get software to practice it from Skytest at a price. They, and others (who have done the test) warn against practicing for this test, as you may become too accustomed to the joystick you practice with and therefore struggle with the one at the DLR on the day.