Three years ago, Jung Yueh won a seat on the Belmont School Committee. Now running for his second term, Yueh said his work isn’t finished yet. Yueh is one of two candidates running unopposed for reelection to the School Committee. The other is Amy Zuccarello. As an actuary and trained mediator, Yueh said he ran for School Committee three years ago believing his experience and perspective would help guide the committee through challenging budget questions and bring an understanding of…