Hi Raju,
Since it has already been a long time, my recommendation to you would be to have a period/ deadline fixed in your mind latest by which you should be able to clear the other group. If you are able to meet the deadline, continue with it, else I don't see a point in continuing.
There is no point in travelling in 2 boats simultaneously (in this case, the job and studies). In real life, sometimes professional experience/ expertise is placed above any formal qualification. I have come accross various people in my organisations, who didn't have CA degree with them or who were CA dropouts but they are really excelling at their jobs. We need to understand the opportunity costs assciated with various options and then make our choice diligently.
Hope it helps!
Regards,
Nayan