Perusal of CS course demands a lot of time and a sincere approach to your studies but once you make up your mind to acquire the same, you have won half of the battle.
You have truely analysed your work and the resultant time approx 9 hours per day would be required for effective discharge of your duty.
Now let us analyse the course module of your course. Supposing that you are a graduate in any stream, you are entitled to get exemption from the foundation - course. In that case, you need to clear executive and professional programme. However, it would be more advantageous on you part if you are graduate from a commerce side. Many of the modules relate to advanced accountancy, taxation - structure, cost - accounting , commercial laws etc.
Now, let us calculate the time which you can conveniently employ for your study - purpose. If you deduct your hours of duty, rest time of night and for other activities including your bath - room, you can have 5 hours at a stretch for your study - assignment. This being a precious time, it has to be utilised judiciously. Get your self enrolled in a quality institute and follow rhe course material provided by them. Go through the question papers of last five years and such visualisation will make you familiar with the pattern of the tests. Moreover, your Institute would provide you innumerable tips to score better in the examination. Don't get panic, your consistent preparation and guidance of the Institute would pave the way for your success.