Well, looking through the groups four fourth placers can end up on 13 points. Of these I have the worst TD difference.
Looking at it right now, only three fourth placers can end up on 13 points, you being one of them. All of you need a win, so already at that point I'd aim for the win in the first place and hope one of the other two only gets a draw.
Especially since in group 10 the 3rd place holder is on 12 points, so if they lose all three of you 4th-placers get up if you win. So just aim for a normal win, and if you can't get that, you are welcome to the CrC
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edit: One of your competition already failed to win their game, so a win is now guaranteed to be enough.