I would second the statement above, in all areas but timing. I think it's more practical to take 52ish questions in the same timeframe (70/60/70mins), then do the rest for practice.
But I would agree with SN2ed for the CBT format. But just do the last 3 CBT exams if you have the rest in the R, unless you have the monetary resources to take all the CBT's, then I would do it that way.
If you look at those test in terms of content and break out the extra 25 questions per section per exam, you have yourself ~4 more practice exams if you split them up. Now that's were the benefit comes in.