To find out how your work SHOULD have been marked, find the website of your exam board eg AQA, EDEXCEL etc and navigate to the course specification for your english literature syllabus. this will give a breakdown of how marks are allocated to coursework and exam work. If your school has returned all the papers, this points at one of three things: the school has made a teaching blunder that has resulted in marks being lower than anticipated; the board has made a blunder in the marking; or the school is indulging in a cynical exercise to divert attention from its own mistakes, by fussing and flapping and blaming the exam board. It is very unusual for mistakes of this magnitude to happen, so I'd be tempted to contact the xam board direct and ask if this is true.
Remarking scripts is a gamble - marks can as easily go down as up.