The Bethel Board of Education will present their $48.6 million budget proposal to the Boards of Selectmen and Finance tonight.  The proposal is a 4.7 percent increase over the current year.  The plan includes three math interventionists,two new elementary school teachers, a new assistant elementary school principal, a custodian and a social emotional coach.  School officials say this takes into account the district's growing enrollment.  Tonight's joint board meeting is at 6:30pm in Meeting Room A of the municipal center.