I’ve never really worked on tremolo; it didn’t really interest me. But for the last few weeks I’ve been making an earnest effort to improve my mediocre tremolo skills.
The one that has helped me the most with tremolo is the first: starting with different fingers. Essentially these exercises work you through four patterns: p a m i, a m i p, m i p a, i p a m. Doing this forces an accent to different fingers, and helps even out the tremolo.
As I work more on tremolo, I’m sure I’ll add more things that have helped me. Stay tuned over the next few months!