Environment related questions in Prelims

No matter how many times i revise for Environment, it has consistently been my low scoring topic. I understand we should not concentrate on one subject alone, but go for a smart appraoch. And that is why I'm here to ask, how do you get your questions right in Environment questions and mostly, how do you apprach the subject with minimal confusion?

PS: I do not wanna leave this topic, bcuz it can help me in Mains.