are the 40 cases from the FA book enough to pass CS? i mean going once through all, then practice with a friend all of them and maybe will have some time to go one more time through them.....i also have kaplan cs book from 2009 which have another 30 cases....should i try to go 2 times through those too or will be enough FA cases??? please guys, exam is in about 3 weeks and i really need your advice...thanks!!

Yes that will be enough.
But try to video record yourself and then analyze.
Also practice Patient note writing.