Kind of, you apply with predicted grades, as far as I can remember, and then you'll know whether you got in on results day. Often schools will ask for a minimum amount of grades e.g. my school has a minimum grade entry requirements of atleast 5 A*-B grades / 5 9-6 grades for you to get into the school. On results day, I met that criteria and so I got offered a place. They offer you places through UCAS. When you apply, you'll receive conditional/unconditional offers from the schools you have applied to. I got a conditional offer, meaning that only if I got the grades, I would be offered a place xx