You should score a minimum of 40 marks in every subject to be eligible to clear both groups. In fact, currently, rank holders obtain 65% approx in aggregate. As Surbhi said, aim for 100 in all subjects so that you get a rank. All the best
Ans :- Around 70% marks in all subjects is sufficient for you to get rank in CA Intermediate | CA IPCC. Your target should be first to complete whole question paper provided during examination on time i.e. 3 hours Attempt all the question in proper order for better presentation so that it had a better Impact on examiner checking the Answer sheets. Good writing skills will proper reasoning to the question will help u achieve good scores in theory subjects.
Aim for 100 in all subjects you will land in a rank. :) Practically speaking, make sure you get 70% of the paper you are sure to be 100% correct. You will land somewhere below that which might most likely be a rank :) Rank is obtained on the basis of marks of all the students as we did in our Schools, colleges.