as now I am in final year of bba and i dont want to persue mba nd I am planning to go for CS. but how long will it take to complete cs course after graduation nd what are the passing chances of cs will student be able to clear this exam in first attempt?

Hello student yes student pass it in first attempt but at the same point it's difficult also. All you need to do hard work for the same. You need to qualify two programs as you're planning to do it after you're graduation 1)Executive programme and 2)professional programme.
It'll take around 3year it you complete both of the levels in first attempt

Feel free to comment if you have any doubt
Good luck