ASP SQL Redirect Page Wrong

I have a registration page in asp.net that calculates class's taken and subtracts that value from total amount of Financial aid they have. After that calculation they are redirected to a page depending on that value. Everything seems to work except for if they have more class's than they have in Financial aid current they get redirected to a page that says you have a credit instead of you owe. This is going to be an easy fix for a sql asp person. I am unable to fix it myself and please note in your bid if you speak english as well. This may be something we need to talk about to save you time. Windows 2003 Standard MS SQL 2005 ASP.NET