Admar Group's net income for the third quarter increased 11% to $117,000 from $105,000 a year ago. Revenues for the third quarter ended Oct. 31 rose 27%, to $2.6 million from $2.1 million in the prior year. The company attributed the increases in revenue and income, in part, to the addition of an acquisition's operations in October. The full impact of SelectCare's revenues, expected to be annualized at $1.5 million, will be reflected in the fourth quarter, the company said. For the first nine months of fiscal 1988, net income dropped 10% to $236,000, from $263,000 a year earlier. Revenues climbed 35%, to $7.5 million from $5.6 million. Admar Group, based in Orange, provides managed health care delivery systems.