Laura Kovach, a high-grade research associate at Boston -based Evergreen funds said: "With everyone coming to the market at once, it could take a toll on the company's ability to get through at a reasonable price, " she added.

BBC: Telecoms scramble for cash

On average, audiences gave "Iron Man 3" an A grade, according to market research firm CinemaScore, meaning word-of-mouth for the film should be strong.

WSJ: Marvel's 'Iron Man 3' Takes in $175.3 Million at Box Office

Fox's domestic distribution president Chris Aronson said he believes the movie will have a long life at the box office, noting that audiences gave it an average grade of A according to market research firm CinemaScore, and there are no more family-friendly films until "Monsters University" opens June 21.

WSJ: 'Fast 6' Leads Record Holiday Haul

Domestic audiences appeared to like "Into Darkness, " giving it an average grade of A, according to market research firm CinemaScore.

WSJ: 'Star Trek' Tops Box Office, Transports Well Overseas

One of her main research projects looked at the relationship between self-control and grade-point average.

NEWYORKER: Don��t!

According to research by the MacArthur Foundation, 65 percent of students starting grade school today will end up doing jobs that have not yet been invented.

FORBES: How to Bring Quality Online Education to a Global Student Population

It also links attendance to attainment in schools, citing research which found pupils who miss 17 days of school can drop a GCSE grade across all subjects.

BBC: Hopscotch

Ofqual's research found many schools used the marks pupils received in their first exams and the January grade boundaries to work out what score a pupil would need in their controlled assessment to get a certain grade and marked it accordingly.

BBC: GCSE English: Teachers' anger over generous marking claim