JAA exams are technically invalid in USA training - so the order doesn't *actually* matter...........but.....
logical recommendations were suggested a long time ago for training in the UK and they make sense for US based operators anyway....
Air Law and VHF Communications (written) before first solo,
Navigation and Meteorology before first solo cross-country
Remainder before skill test.
If you *do* do any JAA written exams in UK and take them to USA the ONLY thing you should carry is a PPL application form with the exam results already entered and signed by an appropriate examiner.
You should not have a "package" of exam papers with you. They stay at the school that you took them at.