<p>i switched from an sat2 to the I's last october-- i called someone from college board and i think in order to have your name on the official list you have to call ~2.5 weeks before the test, but she said that i could still change if i showed up early, and they would guarantee to let me into the test before all of the walk-ins. she told me to bring ~$18 check but the place where i was testing didn't want it- college board billed me later on. you should sign up for the june sat seperately, but if you missed the deadline i'm sure if you call collegeboard they will help you out-- just explain the situation.</p>