Vpower..
I think you are missing out on a bigger pictute...
This was probably on of the general questions. Anybody can sit for few weeks and prepare their math and get 100% form math related questions.
Math is a massive topic, but what they gonna ask you there is just up to some sort of "level"
So you could get 100% from topics that have some sort "limit" of information, means you know what to study.
General knowledge is something much bigger (without limits) and much more important, something that you learn as you go in life.
Reading world news on daily basis, watching documetary shows and so on...
Anybody can watch prison break or lost 7 days a week, play playstation 2-3 hours a day. Re-study math and physics is easy, you cannot re-study general knowledge tho!
So if you scored 100% on math and physics questions and 50-60% on general, but other scored 80% on general and 70-80% math and physics.
Guess who they gonnna take?