Hey passing CA is a big thing in itself. So just pass it off when there is a chance. First of all most of what you study is not how things happen actually. Whatever u learn in practical life through articleship is what matters and what will remain.
Even after passing there is no guarantee that you will remember everything. Its humanly impossible. even if you do not clear it first shot it dosen't matter. Its only a matter of luck. my friend got exact 40 in three subjects in ipcc and one 84 in accounts which covered up for the rest.
Once you pass off that's what will be visible in front. There's something new to learn at every point and everytime you learn something new you forget old things.
once you are a CA it will get you a job then later you need to specialize wherever they put u in. It'l take some time to fit in but u'll learn........best of luck n wish me the same!!!!!!!!!