How can I revise the set texts ?

Including references to the set texts is key to a top essay grade. The key thing to remember, is that you don't have to directly quote from the source, but rather it can be paraphrased. This will save you a substantial amount of time, as you simply need to remember the point made, not the exact phrasing. Also, save time by only picking out two or three points from each set text per essay topic which could come up. That way, you won't overwhelm yourself with too much to remember, but at the same time, you'll still have enough to discuss in an essay.