At last the guys at Fullspate have put together a full, exam-level GCVR test for the Michigan ECPE. All the questions are marked automatically on line to give immediate feedback. It follows the exam format:
40 grammar multiple choice questions (MCQs)
a cloze passage with 20 gaps
40 vocabulary MCQs
4 reading texts with 20 MCQs
The only drawback is that students need a piece of paper to note down their marks in each section if they want to be able to find out their total score at the end.
This is about as close to the genuine thing as you could get.