1. divide your day in two parts.(during day time read subjects like theoretical subjects while during evening take any practical subject so day gets fully utilized)
2. While you read any theoretical subject try to do practice in writing as CA. final papers are quiet lengthy.
3. While doing subjects like Accounts and cost try to solve Institute module. Institute publishes best material.
4. For Subjects like direct taxes and indirect taxes give more effort on understanding sections and their interpretations. Also read case laws from publications published by Institute.
5. For corporate law try to read each and every act and allied laws.
6. For ISCA it is very dry subject at least for commerce students however to clear finals it is essential again here read Institutes module they are quiet good.
and for amendments go on Institutes website you will find updates.
Hope this will help you in preparing for CA. finals. But these are my views you should also consult your coaching teacher (if any) or take help from your seniors.