Can I know, Should I study one subject a day or theory and practical both each day for the CA (CA Intermediate | CA IPCC) exams?

Every subject is equal in importance and you need to give equal time to each subject everyday. Try to o every subject for at least 1 hour everyday and also distribute the time for theory and practical as practical is also important to score good marks in the exams. Try to make such a schedule in which you are able to study all the subjects and also get time to relax. Try to give equal time to theory and practical and do them side by side. If you focus only theory, then you won't be able to do practical and it may become a reason for excess burden on you as the exams come near. Try to make a flexible time table which contains time for every subject and every day.