university of essex, adjustment?

I already know my grades as i done a btec and my teacher was able to let me know early, i recieved three distiction *, i am going to be attending the university of essex however my grades to get in was ddm and im considering maybe doing adjustment, but im scared of not getting halls if i do that ect does anyone have any info on adjustment if its worth it, or if essex is infact what i should stick with. i also heard once that if you stick with essex and exceed the grades requirements you were given a bursury of some kind is this true?
cheers