Facing exam questions are akin to going on a fishing trip. The kind that involves a big boat to capture large amounts of fishes in the middle of the ocean. Not the type that only requires bait and a rod.

So when you first see the questions, its akin to identifying the types of fishes you want to catch. First you gotta research where they often appear in, which waters, how deep, how many in a school, or even if they travel in a school to begin with.

What comes shortly is scanning of the seabed for the school of fishes. In the gigantic ocean, we need to scan part by part of the ocean to locate the fishes. Following the identification of the fishes comes the casting of the net. Casting the net does not ensure all fishes in the school are caught. The cleverer ones escape almost immediately, the smaller ones swim right through the holes in the net and the young ones are prohibited by law to capture.

What remains as the fishes, the substance, might jolly well be just a largely minimized amount as compared to the original potential yield.

Its at this moment that we realize we pretty much screwed up the exam.