You only really need a scientific calculator, a ruler, pens, a pencil/pacer, eraser and I always like yo take a protractor, set square and sometimes a compass (doubt you'll need it) just in case...thats all i can think of
set squares are those triangle thingies... good for drawing perpendicular lines and the like. can't imagine needing one, but if it says to bring it then we all probably should. weird though, i don't remember ever having to use a compass, protractor or set square all year. ah well, off to the news agents to buy all three.
During an important exam, I brought a calculator but forgot to use it...I did all the calculation manually. I didn't realise this until I left there and took the calculator away.