HELLO,

You can buy any book for the entrance purposes as different universities have different way of conducting their exams . But still if you wish to buy something , buy Arihant publication book for M.A preparation .

Read about history of English literature , in market there are plenty of books . Check whichever suits you . History of English literature by David Daiches is most recommended book , make your current flow of preparation in the direction of the entrance preparation books .

Make notes according to prescribed period in the history of English literature , try to read the summaries of all the writers of all the period Chaucer, Shakespeare , Dickens etc .

hope it helps