do you have a date on when you're going to hear back from the other school, or is it just anytime they want? like if you know that you'll hear a response a few days after your deposit is due, you can try asking very nicely for an extension on the deposit , preferably calling them, if not then email. But even if you get an extension, don't expect it to be very long, because they have to send out other decisions to those still waiting to hear back, which will be based upon whether you pay the second deposit or not.