Mercer Island Girls Basketball To help all players reach their greatest potential in basketball and in life. About Us High School Program Varsity, JV and C-Team - Click here for details! Learn More Select Program Competitive league comprised of players from 5th - 8th grades. Learn More How Can you Help? Players and Parents can help in many ways, scorekeeping, personal or corporate sponsorships - please click below and our board will get back to you with options! Email Us Sign Up for Princeton Review and Support MIGB!! Sign Up Today!