<p>Honestly, I’ve met lots of people who are very good at math but are horrible at tests/pressured situations. I’ve met people who are really good at math without trying who do worse than people who try in the class; and I’ve seen situations where the opposite is two. I think it’s a combination of both; the best students will both have the material come easily to them and be hard working, but people on the other ends of the spectrum can succeed as well.</p>