Using your car as your main wardrobe is a top tip, keeping your room with the basic spartan-like er, basics.
Also, take your own ironing board and iron (keep them in your car). The block ones are crap and there's always a queue. Take a set of matching coat hangars for the shirts that once ironed and hung up are not touched again for the next six weeks. Once properly sorted, the bed and wardrobe are pieces of modern art - not to be disturbed! Some guys slept on the floor on a rollmat/sleeping bag which was stowed in the car prior to inspection.
Take a chinagraph pencil and plastic paper - I've seen many guys destroying bits of paper with a pencil in the pouring rain as they try to write down their instructions during 'their lead' (that's when you are given command of your little group to lead them on a task involving lashing pine poles together and transporting a large objct over shark-infested custard).
Don't clear dust at 0100. It will only settle overnight and you have to do it again just before inspection.
It is anal and you will question the pointlessness of some of it. Keep smiling and remember it's only for a few weeks. Don't be jack and willingness to help others wins many brownie points. If you've finished your room and your mate down the corridor has a bed looking like an elephant's nest, get down there and help him sort it out.
Have a great time. The sense of being in it together beats most jobs in civvy street.