The state may put a hold on enrollments in its prepaid college tuition program because of soaring tuition costs and declining investment returns. The Ohio Tuition Trust Authority’s board is expected to act on the issue tomorrow. The board’s executive director, Jacqueline Williams, says the solutions could be to end new enrollments in the fund or suspend all credit sales, including those to the 130-thousand current account holders. The program allows parents to buy credits for future college tuition. One-hundred credits will cover about one year of college in a state university.