imo, the best thing you can do is practice questions. they'll never give texts that require you to look too closely to find techniques, so once you do them a bunch you'll learn to pick up on the patterns and recognise techniques faster. i like to try to see the text as a big picture first, the broadest/easiest techniques to initially pick up on are usually things like tone, structure, setting, point of view etc. that can give you a clue for more specific techniques; breaking down the question into key terms (verb, key themes) is also really important for this since they're essentially giving you hints on what to look for