You really need to start by reading the Q&As:http://www.elevenplusexams.co.uk/appeals/
In section E, for example, you will find an explanation of a 1:1.
You will also see that it's probably not a good idea to mention tutoring.
If I were you, I wouldn't say anything about extenuating circumstances in your written appeal. Wait for the hearing, and just answer any questions as briefly as possible. In section B of the Q&As we advise:
If your extenuating circumstances are not too strong (in the sense that there isn’t any evidence at all to show that your child was affected), the best you can do is to appear reluctant to ‘offer excuses’, to let the panel drag the information out of you bit by bit, if the opportunity arises, rather than to build it up as a major issue. Understate the point, don’t overstate it, or you risk diluting your case as a whole.
I do think it's worth appealing with 118. Based on last year's statistics, you probably have something like a 50/50 chance of success.
Your case is likely to be decided on the basis of academic evidence. Good to see the 5a for maths. It would have helped to have some high alternative reasoning scores. Note carefully what we say about academic evidence here:http://www.elevenplusexams.co.uk/appeal ... cation#b11