Computer based

I don't understand your problem. The standard of questions is exactly the same. The only difference is that for some of the Section A and B questions then you might have to type in an answer rather than choose from four answer. Section C is exactly the same. In the paper based exams you write out your answer. In the computer based exams you type out your answer.

i totally get you Sir, but how will i write arithmetic question on computer? what do you suggest? should i opt for paper based, and i am studying just from your notes and lectures.

For calculating questions in Section C there is a spreadsheet available (and you can also use the word processor). You will also have paper available so you can do your workings for the questions in Section A and B, but of course nobody looks at your workings for these questions, whether you use paper based or computer based.