Cambridge calls part 7 a 'gapped text' activity.
You get a long text with six paragraphs removed (leaving 6 gaps, hence the name of the task).
Your job to is put the paragraphs back into the right place.
It's quite hard, and Cambridge make it harder by including an extra paragraph
that doesn't fit into any of the spaces.
Part 7 is a hard part of the exam that gets easier the more you practice.