Welcome to Appeals!
There should be three parts to your case.
First of all, explain what happened with the special access arrangements, and provide copies of all the emails.
(It would be best not to use textspeak. I would suggest writing "you" rather than "u", and "are" rather than "r".)
Secondly, you will need to provide academic evidence. I note that the school will not co-operate.
See:
https://www.elevenplusexams.co.uk/appea ... cation#b20Thirdly, you need to put forward good reasons for why you want a place at the school you are appealing for:
http://www.elevenplusexams.co.uk/appeal ... -school#c2Do follow the link scarymum helpfully provided further up. It will tell you all you need to know about appeals.