Ah yes but what if Angela gives you a really great bit of advice in her Module 7 report that you could use to up your marks in Module 8? Or what if you had a question on the report for Module 7 that you wanted to include with your Module 8 submission?

Someone actually sent all their modules in one submission once - bit of a shame as they never got the chance to develop over the course.

I'd go with one at a time.