12 May 2016
If you are going to refer only to Practice Manual, then you may be committing a grave mistake. You should practice manual as a complementary book along with your main text or study material. Practice Manual is nothing but a compilation of past examination questions, so it may cover very small percentage of questions that might be asked in the examination.
As you are planning for self preparation buy some the best books available in the market. For instance, for Advanced Management Accounting you can refer to P C Tulsian or Padhuka's book. ISCA lay hand only on ICAI study material. For Direct Tax law you can opt for Vinod Gupta or T N Manoharan and for Indirect Taxes you can buy Bangar's book.