I realise this is an old thread but thought I would update the situation for Colston's Girls' School.
Girls sit a Non Verbal reasoning test in the November, with the option of sitting a languages aptitude test straight afterwards, as 10% (14 places) are awarded to language scholars.
The girls are put into 5 bands based on ability - these are an equal number of girls put into each band, so it doesn't matter how well or badly a girl does in the test.
Names are drawn out randomly from each band, and places allocated, although places are first awarded for siblings, children in care and SEN.
If you are unsuccessful then you can stay on the waiting list. You won't know where you are on the waiting list, as names are drawn out randomly when a vacancy occurs. This is different to BCCS, who will tell you where on the waiting list you are. I think a separate list exists for language scholars.
The facilities have all been updated, with £12m spent on new buildings and refurbishment of existing facilities. The Ofsted report in 2010 rated the school as outstanding across the board. 2013 will be the first year of GCSE results for the comprehensive intake - it will be very interesting to see what happens...