I say to reschedule it if you feel that you're not fully prepared for the exam. Regardless if it's $25 or $10.
Think about it.
Not spend the $25 and take the exam not fully prepared..... and possibly having to take the exam again in the future, which would cost you another $190.
or
take it when you're ready and have no regrets... come on what is $25 when it determines your chances in getting to dental school...
shoot i'll send over some money to you if that is the only factor that's stopping you from rescheduling.... 😛