Univeristy Applications!!

When you UCAS let me know if i am actually going to that uni assuming i get my predicted grades?

I recieved one from portsmouth, and I am going to accept it however I was wondering if it is actually rare since alot of people at my sixth have also got one?

Do i have to choose my firm and insurance unis even if im planning to take a gap year?

I have applied to a number of reputable universities including Kings college london and I Have been rejected by all. I believe that this has to do with the fact that I am doing a BTEC. I was told that if if get triple D* that my chance of getting into the unis that I chose would be reasonable. this