I know for a fact that tge person on 8th position in merit list got 76 marks in test. So if we assume that the topper got 80 marks and got full marks in interview, then his total marks will be (80*0.7)+30=86, assuming the 70:30 criteria. Almost all of us were asked approx 10 questions, so we can also assume that each q had about 3 marks. Now u can calculate your total marks and hence your chances knowing that the max marks were 86