Education advocates seeking more state aid for New York City public schools appealed to the state's highest court, the Court of Appeals, yesterday, asking it to force state lawmakers to allocate the extra money before the legislative session ends in June. The appeal, the latest move in a longstanding lawsuit by the advocacy group Campaign for Fiscal Equity, comes less than a month after a lower court ruled that Albany was shortchanging city schools by at least $4.7 billion a year — but that only the governor and the Legislature, not the courts, could decide exact amounts of education aid. The appeal also comes nearly three years after the Court of Appeals ruled that city students were being denied a sound basic education and that lawmakers should address the problem. Michael A. Rebell, a lawyer for the plaintiff, said he believed that if lawmakers failed to comply with a court order mandating specific increases in state aid, they could face fines and jail time.