I done the English Lit exam (WJEC) last year and got a B. I'm now doing A-levels. For this, it really does depend on the day how nice the poem is as some can be easy to interpret, while others are quite difficult. Luckily for me, mine was a easier one.
Before your try and comment on parts of the poem, make sure you have read and understand the poem first. Many people don't do this, and start writing things that have nothing to do with the poem itself. Once you understand it, the lines should be become easier to interpret as you know what is happening. As long as you understand the poem itself, your points make sense and are backed up, then you should be fine.
Some questions to ask yourself when doing this :
Why is the weather like this?
Why do they do this? How does it relate?
What does their clothes represent?
Why does this event take place?
Many things in a poem happen to create atmosphere, if you catch on to these, you should be fine.
Do as many past papers as you can. This will help you with interpreting information.
Good luck!
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