To get into SRCC, your class 12th results will be the most important. To score a 95 and above 8-10 hours of daily studying is necessary. Revision is one of the key parts. If you also have a proper, more than 75% attendance in your 12th, you are good to go.
Subjects like accountancy and economics cannot be mugged up in a day, so start preparing for them as early as possible.
Try finishing your syllabus before your Pre-Boards and attempt prelims, which will give you an idea about the exam and the proper time frame to complete it in.
Try understanding the practical applicability of the content. Practice as much as possible. There is no other alternative for it.
Set targets for yourself and complete them. Study to learn something new and not only to clear a stage in life.