Fees in 2013 shouldn't be higher and may well be lower - depends how many unis find themselves low on students at the new prices.
The UCAS Application website has details of how you apply through a school or as an individual. Regarding grades it says this:
"If you're resitting a qualification you need to enter it twice: once as a completed qualification with the grade achieved and once as a qualification with the result 'Pending'."
So they will know his current grades and that he is doing resits. The only way round would be to go a year later and put the new results in.
It sounds though as if resits are not his problem. He actually needs to redo the course from what you've said in which case you need to look either at private tuition or schooling or perhaps look at the Adult Education programmes offered by Birmingham.