Hi Nneil Patel,
In the question, it is given that there were 75 questions only, but in your assumed case

Correct= 33, Wrong= 2, and Unanswered= 45, Total questions becomes = 80
Also, it is given that +3 was awarded for the correct answer, -1 was deducted for a wrong answer, and +1 was awarded for the unattempted question
Assuming your case = 33*3 - 2*1 + 45*1 = 142 marks (But in question, it is given that total marks were 97)
Please let me know if you need further assistance.
I hope this helps!

Thank you so much

HI Amaan Ansari,
In the question it is given that the number of  unattempted questions was higher than the number of attempted questions. You considered c>a, well this says that number of unattempted questions are more than the number of attempted questions that are correct. So, you should be considering c>a+b.
I hope this helps!!