It isn't bad, but not perfect by all means. i.e.) It is harder to do loads of GCSE'S (in saying that, doing loads does you no favours, so in that respect the calc.is pretty good)
i think hes talking bout the alis score mine was 10.4
slightly impossible, seeing as the most you can get is 8. slightly flawed system though. person gets 5 gcses all at a* and gets as many points as person doing 11 gcses all at a*