looool so many misconceptions about iium. im currently in the iium foundation center in nilai taking english^^
honestly, the arabic is really easy. i have a friend who has never learned arabic before but during final exam she managed to get an A while i only got a B >.< (eventhough i had learned arabic for nearly 10 years lol. the bits that i learned in secondary school are very complicated for me to comprehend. and im really lazy so yeah

)
and the foudation centre is like 1087363 times more strict than the main campus. my sister is taking econs in the main campus so she told me a lot of stuff goin on there

yes, you can wear jeans to class, nobody would care really. even the lecturers. i went to the main campus a few times and i saw the students wearing skinnies and leggings and that sort of clothing to class. the kind of clothing you can never wear in cfs nilai

for the female non muslim, you have to wear at least something to cover your head. a scarf wouldnt be necessary. just a bandanna would do

the important thing is to cover your head. and oh yes, dress modestly! i think the only thing you cant wear to class are minis and tank tops XD but to be on the safe side, just cover the major parts of your body^^
the pak guards in the main campus are so much better than the ones in the cfs. i got fined rm50 because i didnt wear an anak tudung once >.< thank god i got it reduced to rm10 at the principal's office.
and their system is a bit fgrkivgffrv la. the staffs in the offices always seemed pissed somehow and they're really not friendly. if you ask a lot of questions they might just tell you to piss off or smthng XD