Well, I've decided to take a slightly different approach to the 'norm' for the exam.
During reading time I'll do the usual, read over the text responses, look at the article etc etc...
However, I am going to do one text response first (the part 1) so I can 'get some runs on the board' with something that I'll know that I can get the marks on. Then I'll move onto the media part, and I believe my 'brain will be warmed up', so getting through that won't be too hard. The final hour is always the hardest in my opinion, and either way you finish with a TR. I believe going from writing task to tr for the last hour provides enough of a change to stimulate the brain to get through the final gruelling hour.
This is just my idea, but I've always found doing two TR in a row (especially the last 2 hours...) to result in poorer results compared with splitting them up.