LOS ANGELES  At the University of California at Los Angeles, a student loaded his class notes into a handheld e-mail device and tried to read them during an exam; a classmate turned him in. At the journalism school at San Jose State University, students were caught using spell check on their laptops when part of the exam was designed to test their ability to spell.

And at the University of Nevada, Las Vegas, after students photographed test questions with their cellphone cameras, transmitted them to classmates outside the exam room and got the answers back in text messages, the university put in place a new proctoring system.

"If they'd spend as much time studying," said an exasperated Ron Yasbin, dean of the College of Sciences at U.N.L.V., "they'd all be A students."

With their arsenal of electronic gadgets, students these days find it easier to cheat. And so, faced with an array of inventive techniques in recent years, college officials find themselves in a new game of cat and mouse, trying to outwit would-be cheats this exam season with a range of strategies  cutting off Internet access from laptops, demanding the surrender of cellphones before tests or simply requiring that exams be taken the old-fashioned way, with pens and paper.