how to get database values on selected item of combobox

First trick:

First when you are getting all student id during same time you have to check by join from fee table and catch the value with match the id same . Meanwhile you have got the list check condtion with while first term fee availale or not. if available you have to put at time of bind dropdown sataticallly same sentence.

Second trick:

Create a join and check condtion first term fees submitted or not. Whether it is not submittted you can concatnate same sentence. And you can through the value from DB to UI.