If you're not used to being perceptive one way to begin is to try to pick up alternative meanings. The whole beauty of English is that you can produce any meaning that is valid as long as you have evidence and justification. Thus, if you start to analyse meanings into others with evidence that's one way of being perceptive. Another skill is perhaps gathering other peoples opinions on it and working on alternatives from there.
I am currently predicted a level 9 and one great skill to have that already puts you in a top band is to follow these rules during literature or language: Tend to lean towards analysing a "pair of words" rather than a word. By this I mean try to find two words that perhaps contrast each other or the purpose of the text altogether. Some techniques of contrast can be through alliteration, ideas (juxtaposition would get you a higher grade than oxymoron) or through structure (i.e is that word out of place? (poem wise) or is there different punctuation surrounding that word compared to others).
Another way of being perceptive is by analysing the letters of a word (if you decided to just analyse a word and want to get into top band I recommend this strongly). For example the question could be about weather and a phrase could be "packed hard" see how they use only combinations of hard letters? such as "ck" and "rd" this then forces the reader to say the word/phrase in a harsh sound. Now you give an alternative. This could either resemble the shape of the snow or the motion of the snow falling (harsh sounds could resemble that the snow was falling quite harshly)
Please use these tips they really do help!!!