This link will answer most of your questions:http://www.tbgs.co.uk/admissions-policy/235.html
The "Yes or No" letter will indicate individually whether or not your child has achieved the necessary standard for TBGS, Churston Grammar School and the selective stream at Westlands School. N.B. a "Yes" does not guarantee a place, as the link explains.
I appreciate that you are new to posting here but if you edit an original post, as I see that you have done, and this invalidates part or all of a response to that original post, then it is helpful if you notify the responder.