Listen, do the work, practice and ask questions to do well in the class. He dedicates his time to each student fairly. He doesn't chase people down to do work since he understands those who are motivated will do the work, and he'll answer questions quickly and consisely and to the best of his ability.
Mr Siggins answers questions in a clear and concise manner which is easy to understand. He slightly prioritises more hard-working and dedicated students more (which isn't necessarily a bad thing) but makes sure to get around to everyone.