what are my chances of appealing against non qualification,when getting no support from school
It's not impossible, although it makes things more difficult.
Explain to the appeal panel about the situation you're in. (Don't complain - just be very factual.) They will probably have come across cases like this before, and will understand, but I'm afraid the onus is still on you to assemble as much evidence as you can.
Haven't you looked at the Q&As, B20(a)? - It's a similar question sort of question:http://www.elevenplusexams.co.uk/appeal ... cation#b20