I didn't do Maths A levels and got a C in my GCSE's but I'm doing an Accountancy course now.
Speak to a careers adviser etc - how many people I know that have left school with nothing like the grades in their GCSE's that you are predicted Kim but have gone on to bigger and better things in life. My cousin left school with hardly any GCSE's but is now a computer programmer on some stupid amount of money per year (something daft like £50k odd).