I definitely think 3-5 is way too many. That is an extraordinary amount of money to spend due to being indecisive. I think even 2 is too many given that you have an entire month to decide. Of course this is just my two cents, as I had an easy decision to make and will only be paying 1 deposit. Also, you've already made it this far, so I don't think failing pre-reqs will be a problem! 🙂 Just weight your pros and cons which usually comes down to less money/closer location vs. a more "impressive" private school and decide what you value more than the other! At least boil it down to 2 before January rolls around.