Early British prose and drama
A surprisingly high amount of this stuff will be on the GRE. You can count on questions on Chaucer, Beowulf, and Piers Plowman--those are guarenteed. The other stuff may or may not appear.
Anglo Saxon poems
*Beowulf*
Everyman
*Geoffrey Chaucer*
John Gower
Thomas Malory
Mystery Plays
*Piers Plowman*
*Sir Gawain and the Green Knight*
Robert Henryson
Julian of Norwich
Margery Kempe