The English reads well to me, but I'm very surprised at the order of paragraphs. I would normally start reading at the upper-left of such an instruction sheet, which in this case is "In an accident", something I imagine is as rare in Portugal as it is in Britain.
I would expect the order of paragraphs to be the most likely occurrence first, so probably something like:
- If you need help
- First aid and medical emergencies
- Other recommendations (possibly retitled "General safety guidance" or similar)
- In case of fire
- In any evacuation
- In an accident
That way, the reader reaches the most beneficial advice as quickly as possible, though in this case, (4) and (5) could really go either way round depending which occurs more frequently.
Then the question is whether people read across-then-down or down-then-across:
1 - 2 - 3 or 1 - 3 - 5
4 - 5 - 6 2 - 4 - 6
I
think I'd find across-then-down more natural.