Knowing your texts is preferably the first way to begin studying. For Wilfred Owen make sure you know a descent amount of all 5 poems but also make sure you know 2 or 3 in great depth.
To study just create "teel" or "petel" tables because they create a briklliant breakdown of each point you think you need to know. Hope i helped
You should know all 5 poems (or all articles, chapters etc.) for ANY module. Reason is the Board of Studies have started asking specific poems and chapters to crack down on people who don't read all what is prescribed.