Work to try to build a long-term relationship with your legislators. Thank them for what they have done the last two years to improve public school funding. Keep your message simple and focused on principles. Keep your message personal. Every legislator has a story of how a seemingly small number of calls or letters sometimes only one made the difference on an issue.
Legislators are people, too.
While it is important for you to advocate strongly for your position, don't forget to be polite and reasonable at the same time. State your purpose at the outset. Be constructive if possible. Suggest solutions or better alternatives. Use specific facts and examples to illustrate your point.