How to start ca final study

yes, absolutely 

you should go for 1 group , it is easy as compared to second.

for all the subjects start doing scanner, try to do atleast 3 rounds of all the questions in it.(That s not difficult i round will take 15 days, next rounds in 50% time only)

Method- Start attempting after trying institute material  examples, those topics you are not able to understand just mark them  and move ahead do not get stuck at each topic you are not able to understand.

When you will come to the topic in the 2nd round at which you were stuck, you will feel you are able to understand that topic little more than you were at first.

when you have gone through all the scanner questions, you will confident that atleast you have known all the topics, And it is NOT like i do not know those topic at ALL.