Relying on a basic understanding how things/situations work.
At a new school, I really messed up a math test. I was studying like crazy, learned all formulas that I would need and managed to apply them all in each question on the test, combining all off them each question. Lowest score possible (1 out of 10), as I really messed up. Next test I didn't study, I jusy flipped trough the book, checked 1 situation I didn't understood and made the test. On handing out the teacher asked what I did different then the previous test. I told him I didn't study, I just checked if it was logically to me and decided I understood as much as I could. He told me to do just that on all tests and I'd have no problems with education and gave me the result, a perfect score. (10 out of 10)
That was 34y ago and still I want to understand things and see the logic behind it. Works perfectly on almost everything. (Humans behavious still mostly eludes me though, totally illogical ๐คจ)