Ranching and farming groups got word yesterday that the Supreme Court will hear their challenge to the Clinton administration’s revised livestock grazing policies for federal land throughout the West. The court voted to weigh an appeal that says the administration’s 1995 rules, intended to improve management and protection of the land, violate federal law and threaten the livelihood of tens of thousands of ranchers. Arguments in the case will be heard this winter, and a decision is expected by late June. Meanwhile, the court yesterday heard arguments in a case that could restrict the rights of citizens to file suits against polluters.