How to calculate result from a scanning page...

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C#

C#4.0

Dear sir,
I want to develop an asp application for an entrance examination system. Here I prepare multiple questions and answers. Each question contains 4 answer and among of them one is correct. So for that I used radio buttons. after the questions are prepared we print these questions and student have to mark one of the correct answers.

So now I need your help. After the examination I have to scan the pages and need to match the tick marks as the answers that stored in my database. So as per the check I have to calculate how many answers are ticked correctly and based on that they should get their marks. it looks quite difficulty for me, so plz give me some solution for solve this problem...