Hello pravin, i hope you will understand the answer given below.

there is simple formula for your question to be answered. you get 4 marks for the correct question against your response and you get -1 for each wrong answer. futher, if you have left any question or a number of questions then it is not marked, it is left as it is, no positive marks and no negative marks for the unanswered question.

so they have given the marks for the questions that you have attempted and they have not given the marks for the question that you have not attempted.

I hope it helps. All the best!!