First time contributor, long time teacher and tutor. For each thing I d/l from here, I'll post some wisdom back.
Ask yourselves - how many opinion pieces from 'major newspapers' have been on the exam since 2000?
Answer: none.
There have been consultancy reports, speeches, local newsletters, letters, magazine articles, blog entries, ads, emails etc.
But no standard 'opinion piece'. Be ready for something more specialised with a fairly clear target audience whose values, knowledge and typical use of language has been targetted. Ever since the disaster of the "tattoo" exam piece, you can expect the examiners will stay in their shells and keep the issue and format fairly traditional. Two speeches with slides in three years make me think it might be time for an online article with links again. Analyse the format and image in terms of how it suits the purpose of the piece. And for god's sake don't obsess over 'techniques'.
MODERATOR EDIT Split from here:
Section C - Language Analysis - Sample Text Repository