The college class of 2012 is in for a rude welcome to the world of work, the Associated Press reports. A weak labor market already has left half of young college graduates either jobless or underemployed in positions that don’t fully use their skills and knowledge. Young adults with bachelor’s degrees are increasingly scraping by in lower-wage jobs — waiter or waitress, bartender, retail clerk or receptionist, for example — and that’s confounding their hopes a degree would pay off despite higher tuition and mounting student loans…